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  • Gardening Under Mature Trees with Christina Pfeiffer

    Live Webinar

    A recording of this extremely popular and useful lecture is available for purchase and viewing through October 23, 2025. Pacific Northwest gardens often boast an enviable range of conifers and hardwoods, but successfully planting underneath them can be challenging due their substantial root systems, heavy water demands and expanding shade. In addition, misunderstandings about mature... Read More

  • Dishing Dirt with Richie and Bess: Fall Gardening Made Easy

    Live Webinar

    Join horticultural experts Bess and Richie as they dig into the joys of autumn gardening. This lively webinar will highlight practical tips to keep your garden thriving through the season, and also explore perennials and grasses that shine in the fall garden, from vibrant foliage to late-season blooms. Review the essential chores that prepare your... Read More

  • Spooky Season-al Color at the Arboretum with Cynthia Welte

    Graham Visitors Center 2300 Arboretum Dr E, Seattle, WA

    “Spooky Season" encompasses all that we love as the chill of autumn approaches: the imagery and customs associated with Halloween and fall, like ghost stories, cozy sweaters, crackling leaves underfoot... Read More

  • Celebrating the Winter Garden with Warren Leach

    Live Webinar

    Drawing from decades of experience in zone 7a, landscape horticulturist Warren Leach celebrates the rewards of cold-weather gardening in “Plants for the Winter Garden: Perennials, Grasses, Shrubs, and Trees to Add Interest in the Cold and Snow” (Timber Press, 2024). The title is an American Horticulture Society Book Award Winner and is lauded for its... Read More

  • Fall Color and Practices at the Miller Garden with Maggie Rutherford (SOLD OUT)

    Elisabeth C. Miller Botanical Garden (Address will be made available to registrants two days prior to event.) Seattle, WA

    Elisabeth Miller regularly designed and selected plants for her garden with autumn interest in mind. From the first whispers of fall in September to the fading last days of the season in November, the Garden is full of color and drama. Thanks to flaming foliage and fall-blooming bulbs, as well as plants with interesting berries,... Read More

  • NHS 2025 Annual Meeting and Lecture (Members Only)

    Center for Urban Horticulture, NHS Hall 3501 NE 41st St, Seattle, Washington, United States

    SCHEDULE OF EVENTS at the Center for Urban Horticulture, NHS Hall 1:00 PM: Doors open 1:00 – 1:30 PM: Plant sale (Keeping It Green) & socializing 1:30 PM: Official business... Read More

  • Holiday Wreath-Making Workshop with Michelle Rau

    Edmonds College Horticulture Department 20000 68th Ave W., Lynwood, WA, United States

    2 Sessions Morning Session 10:00 AM - 12:00PM  Afternoon Sessions 1:00 PM - 3:00 PM  Yes, it’s already time to start planning for the holiday and winter season! Board Member... Read More