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MS Thesis Final Defense | Allie Howell

Title: As above so below? Trampling effects on alpine and subalpine soil seed banksa Committee Members: Jon Bakker, Chair, UW SEFS Beth Fallon, Member, National Park Service and SEFS Affiliate Faculty Julie Larson, Member, UW SEFS Abstract: Mount Rainier National Park’s subalpine and alpine meadows are a popular recreation destination, but heavy visitation results in off-trail vegetation trampling. Repairing trampling damage in the alpine and subalpine is a challenge because plant growth is slow and restoration is resource-intensive. Climate-change-driven shifts towards hotter, drier growing seasons may make restoration even harder. The soil seed bank could be a convenient, low-cost tool to buffer restored areas against climate change impacts where nonnative species invasion risk is low by increasing diversity. I evaluated the size and composition of the germinable soil seed bank and compared it to aboveground vegetation communities in trampled and intact areas across an elevation gradient at Paradise, Mou… Contact: amh75@uw.edu. Accessibility Contact: sefsmain@uw.edu. Monday, June 1, 2026, 12:30 PM – 1:30 PM. Douglas Research Conservatory Classroom or via Zoom Zoom link - https://washington.zoom.us/j/6944956308. For more info visit washington.zoom.us.

MS Thesis Final Defense | Noah Krakoff

Title: Examining the Strengths and Limitations of using FIA Plot Data and LiDAR-based Structural Metrics for Continuous Mapping in the Sierra Nevada Ecoregion Committee Members: Van R Kane, Chair, UW SEFS Susan Prichard, Member, UW SEFS Hans-Erik Andersen, USFS Maureen Kennedy, UW Science and Mathematics Abstract: Model-based estimation with airborne LiDAR and the United States Forest Service Forest Inventory and Analysis (FIA) program is common way to map metrics like above- ground carbon (AGC), basal area (BA), and wood volume (WV) in forested areas. This study investigates how well the FIA plots capture the Sierra Nevada ecoregion and what structures and conditions they fail to capture for effective model-based estimation of AGC, BA, and WV. Random Forest models were used to model these three metrics with R 2 values of 0.77, 0.64, and 0.86, respectively. FIA plots captured 96%, 97%, and 96% of ecoregion for each forest metric, respectively. Two structure types are not well sampled. First, FIA plots do n… Contact: nkrakoff@uw.edu. Accessibility Contact: sefsmain@uw.edu. Monday, June 1, 2026, 2:00 PM – 3:00 PM. Anderson G24 or via Zoom Zoom link: https://washington.zoom.us/j/95496753069. For more info visit washington.zoom.us.

MS Thesis Final Defense | Rachel Buchler

Title: Plants as Proxies: Mapping Hydrophytic Intrinsic Potential (HIP) from Citizen Science Observations as a Soil Moisture Indicator  Committee Members: L. Monika Moskal (chair), UW SEFS  David Butman, UW SEFS   Meghan Halabisky, UW SEFS, and TealWaters David D’Amore, SEFS Affiliate, and US Forest Service   Abstract: Soil moisture is a critical environmental variable, with ties to forest resilience, plant community composition, and carbon storage. Increasing drought severity and hydrological fluctuations will impact forest health, altering the spatial distribution and temporal dynamics of soil moisture, underscoring the urgency of soil moisture mapping. However, modeling and mapping soil moisture is challenging in heavily forested environments where traditional remote sensing methods cannot penetrate the canopy. This is confounded by the challenges of in situ soil moisture monitoring, stemming from the high temporal and spatial heterogeneity of soil moisture. This gap leaves land managers without the fin… Contact: racheldb@uw.edu. Location/Room: WINK 107. Accessibility Contact: sefsmain@uw.edu. Monday, June 1, 2026, 3:00 PM – 3:45 PM. Winkenwerder 107 or via Zoom Zoom link - https://washington.zoom.us/j/96435140173. For more info visit washington.zoom.us.

SEFS Faculty Meeting (11:30am - 12:30pm)

Agenda. Contact: Mary Keyes: mkeyes2@uw.edu. Accessibility Contact: sefsmain@uw.edu. Tuesday, June 2, 2026, 11:30 AM – 12:30 PM. Anderson Hall G25.

CANCELLED - The Eagles of Washington (Online)

Cost: $25 - Advance registration required. Financial aid slots available on a first-come, first-served basis, REGISTER ONLINEThe Bald Eagle is our most beloved bird, the emblem of our country. Almost as admired are their cousins, the Golden Eagles. But do these apex predators deserve their noble reputations? Benjamin Franklin believed eagles were the opposite of honorable, nothing more than thieves, and wanted the turkey as our national bird. So, noble kings/queens of the sky or brazen thieves? You be the judge. Come hear master birder Connie Sidles tell you all about the eagles of Washington. New to Zoom or need more information? Get Started Here. All times are Pacific Time. Accessibility: Closed captioning (through Zoom) is available for all of our online classes. This class will be recorded and available for registrants for 2 weeks after the class date. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Constance Sidles. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_8738c309064f. Tuesday, June 2, 2026, 7:00 PM – 8:30 PM. For more info visit apps.ideal-logic.com.

MS Thesis Final Defense | Jaminfae Noble Reduque

Title: Production of lignocellulosic nanomaterials from thermomechanical pulp fibers and their applications in plant-based materials Committee Members: Renata Bura, Chair, UW SEFS Richard Gustafson, UW SEFS Anthony Dichiara, UW SEFS Abstract: Lignocellulosic nanofibrils (LCNFs) have recently gained popularity as a nanomaterial due to their unique chemical and physical properties and sustainability in feedstock source and application. In recent years, the challenge with the commercial production of LCNFs is that current methods of producing them use toxic chemicals and require expensive starting materials. It has been demonstrated that an alternative chemical treatment using peracetic acid (PAA) oxidation was effective in creating NFC from wheat straw fibers, but the process itself is complicated and comes at a high capital cost. We’ve developed a method to produce nanofibrillated cellulose using the same PAA oxidation on high-lignin thermomechanical pulp (TMP) fibers, which are widely available and, ther… Contact: jreduque@uw.edu. Accessibility Contact: sefsmain@uw.edu. Thursday, June 4, 2026, 10:00 AM – 12:00 PM. Winkenwerder 105 or via Zoom Zoom link: https://washington.zoom.us/j/6560321189?omn=92437672971. For more info visit washington.zoom.us.

PhD Final Exam Dissertation Defense | Ryan R. Garrison

Title: The effect of evolutionary history on plant-insect and plant-pathogen interactions Committee Members: Patrick Tobin, Chair, UW SEFS Richard Olmstead, GSR, UW Biology Soo-Hyung Kim, Member, UW SEFS Marianne Elliott, Member, Washington State University Abstract:  One of the most serious and urgent threats to both agricultural and ecological plant systems are invasive species, especially invasive insect herbivores and plant pathogens that pose threats to plant health globally, resulting in significant ecological and economic damage. Arboreta and botanic gardens amass collections of plants from all over the world and, unintentionally, insects and plant diseases from other regions, which presents the serendipitous opportunity to identify and document new associations between plants and the pests and diseases that attack them. Botanic gardens have an institutional capacity to contribute to scientific studies of these pests and diseases, stemming from the living and preserved collections of plant diversity… Contact: rgarris@uw.edu. Accessibility Contact: sefsmain@uw.edu. Friday, June 5, 2026, 10:00 AM – 11:00 AM. Douglas Research Conservatory (DRC) room 103 or via Zoom Zoom link - https://washington.zoom.us/j/5065258666. For more info visit washington.zoom.us.

MS Thesis Final Defense | Priscilla Sperandio

Title: Fire Resistance in Planted Western Larch Stands under Tribal Stewardship on the Colville Reservation Committee Members: L. Monika Moskal, Chair, UW, SEFS Van Kane, Member, UW, SEFS Susan J. Prichard, Member, UW, SEFS Cody Desautel, SEFS Affiliate, Executive Director, Confederated Tribes of the Colville Reservation Abstract: Wildfire severity in the inland Pacific Northwest has increased under the combined effects of climate change, fire exclusion, and a long history of land management that excluded Indigenous stewardship. Historically, western larch (Larix occidentalis) was maintained by frequent, low- to moderate-intensity fires, but under fire-suppression policies and following widespread clearcutting, western larch has been increasingly outcompeted by shade-tolerant species, contributing to denser, more fire-prone forests. This research explores how Tribal-led restoration on the Colville Indian Reservation is reintroducing western larch to the landscape and how these forests respond to wildfire.… Contact: pspera@uw.edu. Accessibility Contact: sefsmain@uw.edu. Monday, June 8, 2026, 12:00 PM – 1:00 PM. Remote defense via Zoom - https://washington.zoom.us/j/6187848682. For more info visit washington.zoom.us.

SEFS Faculty Meeting (11:30am - 12:30pm)

Contact: Mary Keyes: mkeyes2@uw.edu. Accessibility Contact: sefsmain@uw.edu. Tuesday, June 9, 2026, 11:30 AM – 12:30 PM. Anderson Hall G25.

Botanical Fiber Art Workshop: Cactus Embroidery Basics (in-person)

Class Cost: $50, pre-registration required  REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Calling all cactus lovers! Learn beginner and advanced embroidery in this cactus-inspired workshop with fiber artist Melissa Galbraith of MCreativeJ. This two-hour, hands-on workshop covers a variety of beginner-friendly embroidery stitches including the back stitch, reverse chain stitch, couching, needle weaving, and more! Each attendee will receive a full kit. Kits include: a wooden embroidery hoop, cactus transfer designs, embroidery needle, full skeins of embroidery thread, a surprise pattern fabric, backing materials, and printed instructions.Melissa Galbraith is the fiber artist behind MCreativeJ. She was born and raised in the desert of Washington state where her mother instilled a love of making things by hand at an early age. Melissa shares her love of nature through whimsical and modern hand embroidery kits, workshops, and her books: 3D Botanical Embroidery &… Event interval: Single day event. Campus location: Center for Urban Horticulture Complex (CUH). Accessibility Contact: urbhort@uw.edu. Presenter: Melissa Galbraith. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_afa643469ec1. Wednesday, June 10, 2026, 6:00 PM – 8:00 PM. For more info visit apps.ideal-logic.com.

SEFS Graduation Celebration

Details about SEFS Graduation Celebration can be found on the SEFS' website. More information about the event and the reception will be made available in the coming weeks. Contact: sefsadv@uw.edu. Accessibility Contact: lectures@uw.edu. Friday, June 12, 2026, 1:00 PM – 2:30 PM. Kane Hall Room 130. For more info visit sefs.uw.edu.

Urban Foraging: Weeds & Wild Foods (in-person)

Cost: $45 Financial aid slots available on a first-come, first-serve basis, REGISTER ONLINE Participate in this 'weed walk' and learn how to identify and gather some of the most common edible weeds and wild foods available in your garden and in other disturbed areas. Many gardeners are already recognizing many of the benefits of these 'interlopers.' However, when it comes to serving them up in the kitchen, few of us have learned to take full advantage of these labor-free gifts. This hands-on workshop at Discovery Park includes discussion on gathering ethics, local rules and regulations, safety, and general information about how to cook with weeds. Attendees receive a handy take-home flier with field identification information and cooking tips. Instructor Melany Vorass Herrera studied ethnobotany at Evergreen State College and holds a degree in environmental policy. For well over 20 years, her public policy work focused on such subjects as stormwater, hazardous waste, solid waste, environmental cleanup and… Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Melany Vorass Herrera. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_3e940beb422a. Saturday, June 13, 2026, 1:00 PM – 4:00 PM. Discovery Park, North Parking Lot. For more info visit apps.ideal-logic.com.

Gardening with the Seasons: Summer (in-person)

Cost: $35 Financial aid slots available on a first-come, first-served basis, REGISTER ONLINE, Join us in person at the Center for Urban Horticulture! Summer brings an abundance of growth and blooms...and sometimes garden problems. Managing weeds and irrigation are prime targets for attention at this time of year. Time-saving tips for proactive garden care will help gardeners have more time to enjoy their gardens. Key topics will include care of seasonal containers, watering practices, potential weed and pest problems to be aware of, and specialized pruning practices for the season. In addition to hands-on demonstrations, we will end the class by taking a stroll through the Center for Urban Horticulture’s gardens. About this series: Plants and gardens don't live by the written calendar, but by the seasonal cycles and cues of changes in daylight, temperature, and moisture. When gardeners become acquainted with the seasonal rhythms and life cycles in the garden, and learn to work in sync with nature, caring for… Event interval: Single day event. Campus location: Center for Urban Horticulture Complex (CUH). Campus room: Douglas Research Conservatory. Accessibility Contact: urbhort@uw.edu. Presenter: Christina Pfeiffer. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_0e61db27fb6e. Saturday, June 20, 2026, 10:00 AM – 12:15 PM. For more info visit apps.ideal-logic.com.

Forest Bathing (in-person)

Cost: $25 for first registration, $15 for each additional ticket Advance registration required. REGISTER ONLINE Join UW Botanic Gardens and Cascadia Forest Therapy for a unique forest bathing opportunity in the Washington Park Arboretum. Forest bathing (or shinrin-yoku) has been popular in Japan for decades and is gaining momentum in the US. The practice encourages you to move in nature at a slower pace and take in the atmosphere around you. Multiple scientific studies have shown that the practice lowers stress and blood pressure levels, while increasing immune system functioning, making you more resilient to diseases and illness. During this class the guide, in partnership with the forest, will offer an evolving series of invitations crafted to help participants slow down and open their senses. The opening of one’s senses encourages mindfulness, which readies the heart and mind to be fully present in the natural world. Come discover the medicine of being in the forest. Accessibility: These sessions are… Event interval: Single day event. Campus location: Washington Park Arboretum (LNDMK-8). Accessibility Contact: urbhort@uw.edu. Presenter: Cascadia Forest Therapy. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_796ca173cc21. Saturday, June 20, 2026, 10:00 AM – 11:30 AM. For more info visit apps.ideal-logic.com.

Field Sketching Plants in Watercolor (in-person)

Cost: $60 Advance registration required Financial aid seats available on a first-come, first-served basis. REGISTER ONLINE, Do you love botanical art? Do you like to spend time outside? Combine the two in this nature journaling class that focuses on plants. In this class you’ll learn techniques to document the experiences you’re seeing in nature, how to improve your observational skills, how to combine pen and watercolor to create your pieces, how to create a pleasing composition, and color relationships. You’ll also learn how to use creative prompts to connect further and deeper with nature. Come create a memory of a place! During inclement weather, class will be held under cover. , Students must bring their own art supplies. A supply list will be provided with your confirmation email. Robin Bundi is a teacher, artist, and designer living in Seattle, Washington. She loves to explore the natural world and primarily creates work to celebrate the natural world and our connection to it. Robin’s studio practice… Event interval: Single day event. Campus location: Washington Park Arboretum (LNDMK-8). Accessibility Contact: urbhort@uw.edu. Presenter: Robin Bundi. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_7c901a1553f8. Saturday, July 11, 2026, 10:00 AM – 1:00 PM. For more info visit apps.ideal-logic.com.

Master Pruner - Full Series (in-person)

Cost: $350 for current PlantAmnesty Members, $410 for non-members Financial aid slots available on a first-come, first-served basis, REGISTER ONLINE Sign up for the whole Master Pruner Series at once and receive a series discount! This lecture series, offered twice annually in partnership with PlantAmnesty, is designed for those who work in landscape maintenance. Each lecture provides information on tools and techniques for quality pruning with better long-term results and customer satisfaction. The series runs every Monday for 6 weeks, July 13th - August 17th, with 2 lectures on each Monday at 9:30am-11:30am and 12:30pm-2:30pm. Registration for the full series bundle closes the first date of the series, July 13th, 2026. The Master Pruner - Full Series includes these 12 Master Pruner lectures:Tree Pruning I: How Trees Grow & Respond, Shrub Pruning I: The Friendly, Fearless, & Forgiving, Tree Pruning II: How, When, & What to Prune, Shrub Pruning II: Shearables, Hackables, and Untouchables, Tree Pruning III:… Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ellie Bender, Christina Pfeiffer, Bess Bronstein, Kristin Jackson, Ben Mark, Ingela Wanerstrand, & Laura Watson. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_3048fb05b2f8. Monday, July 13, 2026. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Tree Pruning I - How Trees Grow & Respond (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn about the science and biology behind successful tree pruning. Understand the structures, functions, and natural defenses of trees and how those affect plant responses to pruning. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ellie Bender. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_4119bc6326a1. Monday, July 13, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Shrub Pruning I - The Friendly, Fearless, & Forgiving (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. This class covers basic cuts, basic plant habits and what Cass Turnbull called the “pruning budget”. It also covers five plants that are relatively easy to prune:  nandina, evergreen azalea, lilac, camellia, and yew. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Christina Pfeiffer. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_ad01e172a208. Monday, July 13, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Taking the Edge Off: Pruning for Natural Areas Workshop (in-person)

Cost: $80, pre-registration required REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Natural area landscapes hold an important place and functions in the urban environment. Managing vegetation along trails, roads, and other edges can pose a variety of challenges for the available stewardship resources. This lecture and hands-on workshop will cover how to manage and prune native vegetation adjacent to trails, drives, and streets for optimal environmental functions, appearance, safety, & visibility. The lecture will include current best pruning practices and how they translate for the specific goals and functions of natural area plantings. Considerations for reducing long-term labor needs and how to lengthen the time between pruning cycles will be covered, along with common pruning techniques that are ineffective and why. After the lunch break, the class will meet at a field site in NE Seattle for hands-on field instruction. Students will get practice using the best… Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Hillary Ethe. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_c42668d28581. Thursday, July 16, 2026, 9:00 AM – 3:00 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Forest Bathing (in-person)

Cost: $25 for first registration, $15 for each additional ticket Advance registration required. REGISTER ONLINE Join UW Botanic Gardens and Cascadia Forest Therapy for a unique forest bathing opportunity in the Washington Park Arboretum. Forest bathing (or shinrin-yoku) has been popular in Japan for decades and is gaining momentum in the US. The practice encourages you to move in nature at a slower pace and take in the atmosphere around you. Multiple scientific studies have shown that the practice lowers stress and blood pressure levels, while increasing immune system functioning, making you more resilient to diseases and illness. During this class the guide, in partnership with the forest, will offer an evolving series of invitations crafted to help participants slow down and open their senses. The opening of one’s senses encourages mindfulness, which readies the heart and mind to be fully present in the natural world. Come discover the medicine of being in the forest. Accessibility: These sessions are… Event interval: Single day event. Campus location: Washington Park Arboretum (LNDMK-8). Accessibility Contact: urbhort@uw.edu. Presenter: Cascadia Forest Therapy. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_d75566bafc31. Saturday, July 18, 2026, 10:00 AM – 11:30 AM. For more info visit apps.ideal-logic.com.

Native Plants 101: Field Identification (in-person)

Cost: $30, advanced registration required Financial aid available on a first-come, first-served basis, REGISTER ONLINE, Learn some of Western Washington’s common native plants as well as pick up a few tips on plant identification in general! We’ll cover several different species of native plants as well as their growth preferences and how best to incorporate them into your garden or yard at home. This class will be taught by Lea Dyga, Oxbow Farm’s Native Plant Nursery Manager, formerly the SER-UW Native Plant Nursery Manager. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Lea Dyga, Oxbow Farm Native Plant Nursery Manager. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_4ae79eddd031. Saturday, July 18, 2026, 10:00 AM – 12:00 PM. Washington Park Arboretum 2300 Arboretum Dr E. For more info visit apps.ideal-logic.com.

Master Pruner: Tree Pruning II - How, When, & What to Prune (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn about ANSI standards and best management practices. The four basic pruning cuts and their uses will be discussed in detail. Timing and pruning budgets will also be covered.  Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ellie Bender. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_e4ee1746967f. Monday, July 20, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Shrub Pruning II - Shearables, Hackables, & Untouchables (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. There are some plants that are cut to the ground each year, but there are others you barely touch and it’s pandemonium! Find out which ones are which, as well as which plants are appropriately sheared every year. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Kristin Jackson. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_cdb422456442. Monday, July 20, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Tree Pruning III - Specialized Pruning Strategies (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn how to prune trees for various purposes.  Included will be guidance on training young trees and maintaining mature trees, along with discussions of specialized tree pruning techniques. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ben Mark. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_200805b01124. Monday, July 27, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Japanese Garden Pruning (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Creating and maintaining a Japanese Garden requires a high level of pruning skill and dedicated annual maintenance. This class covers the pruning of Japanese maples (upright and weeping), bamboo, cloud pruning pines, and shearing masses of lower story plants. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Bess Bronstein. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_1c33e2e6cc49. Monday, July 27, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Shrub Pruning III - The Puzzlers and Consequences (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn how to prune Rhododendron, Hydrangea, Callicarpa (Beautyberry), Viburnum bodnantense, and Abelia. Included in this class are basic pruning techniques, common pruning mistakes, and some corrective pruning. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ellie Bender. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_308bb92c10b1. Monday, August 3, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Corrective Pruning (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn restoration strategies for trees and shrubs that have been mal-pruned. Mal-pruning may include topping, over-thinning, inappropriate shearing, and more. Included is discussion of watersprouts, suckers, radical renovation techniques, and crown restoration. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Christina Pfeiffer. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_4d29c8358866. Monday, August 3, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Native Plants 101: Field Identification (in-person)

Cost: $30, advanced registration required Financial aid available on a first-come, first-served basis, REGISTER ONLINE, Learn some of Western Washington’s common native plants as well as pick up a few tips on plant identification in general! We’ll cover several different species of native plants as well as their growth preferences and how best to incorporate them into your garden or yard at home. This class will be taught by Lea Dyga, Oxbow Farm’s Native Plant Nursery Manager, formerly the SER-UW Native Plant Nursery Manager. Event interval: Single day event. Campus location: Center for Urban Horticulture Complex (CUH). Accessibility Contact: urbhort@uw.edu. Presenter: Lea Dyga, Oxbow Farm Native Plant Nursery Manager. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_deecde2015d0. Saturday, August 8, 2026, 10:00 AM – 12:00 PM. For more info visit apps.ideal-logic.com.

Master Pruner: Renovate & Prune the Overgrown Landscape (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. This is one of PlantAmnesty’s most popular classes and offers an introduction to pruning and other approaches for landscape renovation. Learn how to undo overplanting errors, when and how to transplant, and how to clean up a neglected landscape. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ellie Bender. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_5bedd2dee65b. Monday, August 10, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Hedging Your Bets - Pruning Art or Pruning Horror? (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Instances of mal-pruning and good intentions gone awry are sometimes explained away as “pruning art.” From improperly sheared hedges to ineffective design and training, this class will contrast examples of mal-pruning with bona-fide forms of pruning art and show how to use them to best effect. We’ll cover hedges and topiary, espalier, coppicing, pollarding, and pleaching, ending with a humorous note with slides from Cass Turnbull’s “The Good, The Bad, and the Bizarre” collection. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Christina Pfeiffer. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_47e8580c2149. Monday, August 10, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Gardening with Edible & Medicinal Native Plants (in-person)

Cost: $30, advanced registration required Financial aid available on a first-come, first-served basis, REGISTER ONLINE, Join us for an exploration of the edible and medicinal plants native to the PNW. In this interactive class, you'll learn how to identify, grow, harvest, and utilize 10+ local plants with nourishing and healing properties. Throughout the session, you'll gain practical knowledge on how to incorporate these plants into your daily life and learn how to cultivate them in your own garden. Plus, you'll have the chance to sample a variety of edible plants and create a custom tea blend to take home.  This class will be taught by Lea Dyga, Oxbow Farm’s Native Plant Nursery Manager, formerly the SER-UW Native Plant Nursery Manager. Event interval: Single day event. Campus location: Center for Urban Horticulture Complex (CUH). Accessibility Contact: urbhort@uw.edu. Presenter: Lea Dyga, Oxbow Farm Native Plant Nursery Manager. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_a0d6a56d1298. Wednesday, August 12, 2026, 6:00 PM – 8:00 PM. For more info visit apps.ideal-logic.com.

Master Pruner: Fruit Tree Pruning (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. Learn the basics of fruit tree pruning and how seasonal growth differences and specific goals affect when you use different pruning approaches. Apple, cherry, plum, and pear pruning will be addressed. Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Ingela Wanerstrand. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_c802300b6c04. Monday, August 17, 2026, 9:30 AM – 11:30 AM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.

Master Pruner: Vine Pruning (in-person)

Cost: $35 for PlantAmnesty Members, $75 for non-members REGISTER ONLINE, Limited financial aid slots offered on a first-come, first-serve basis. This class covers pruning and management of some of our most common ornamental vines: wisteria, common varieties of clematis, Boston ivy/Virginia creeper, trumpet vine, and honeysuckle.  Part of the Master Pruner Series held in partnership with PlantAmnesty. Professional credits pending: ISA - 2, APLD - 2, CPH - 2, ecoPRO - 2, NALP/WALP - 2, LA-CES - 2. Event interval: Single day event. Accessibility Contact: urbhort@uw.edu. Presenter: Laura Watson. Contact Information: urbhort@uw.edu. Ticket Link: https://apps.ideal-logic.com/uwbg?key=2WSB-TGY2T_K9KH-5PTF_647517d3d68f. Monday, August 17, 2026, 12:30 PM – 2:30 PM. Center for Urban Horticulture 3501 NE 41st Street Seattle WA 98105. For more info visit apps.ideal-logic.com.