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Oct 9, 2026 | Bulletin

Hidden Treasure of the Arboretum: Witch-Alder

Fall foliage close-up of a witch-alder in the Arboretum’s Woodland Garden. (Photo by Niall Dunne) BY PHIL WOOD As a retired garden designer, I...

Aug 28, 2026 | Bulletin

Symbiotic Marvels: Get to Know the Small but Mighty Lichens of the Arboretum

Figure 1: Lichens on the Ceanothus in the Graham Visitors Center parking lot, including Ramalina farinacea, Usnea species (fruticose), Evernia...

Aug 10, 2026 | Bulletin

Conservation Corner: Large-Winged Wingnut

The winged fruits of Pterocarya macroptera maturing in summer. (Photo by Niall Dunne) BY CHRISTINA PFEIFFER Quietly tucked away in the Arboretum’s...

Jul 8, 2026 | Bulletin

Fabulous Fabiana

Fabiana imbricata f. violacea blooming in the Arboretum in summer. (Photo by Cynthia Welte) BY CYNTHIA WELTE As a horticulturist, I have been...

Jun 19, 2026 | Bulletin

Japanese Garden Hosts Groundbreaking Ceremony for Ishigaki Wall Project

Guests at the groundbreaking ceremony for the Ishigaki Wall project. (Photo by Holly Cuaresma) BY RUMI TSUCHIHASHI On June 15, 2026, the Seattle...

Jun 3, 2026 | Bulletin

Japanese Stewartia: A Four-Season Beauty That Lights Up the Garden

Japanese stewartia blooms in late-spring and early summer in our region. (Photo by Niall Dunne) BY CORINNE KENNEDY Stewartia pseudocamellia is a...

May 14, 2026 | Bulletin

Douglas Fir Tea: Ethnobotany and Health Benefits

The bright-green spring foliage of Douglas fir is prized by foragers for making tea. BY REBECCA ALEXANDER & NIALL DUNNE This regular column...

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Black Walnut Tree in Arboretum Tests Positive for Thousand Cankers Disease

Oct 15, 2026

Cankers and beetle feeding holes on the inner bark of a downed walnut branch. (Photo courtesy: Elizabeth Bush, Virginia Polytechnic Institute and State University, bugwood.org)FIRST DOCUMENTED CASE IN WESTERN WASHINGTON! This summer, Seattle Botanic Gardens...

Hidden Treasure of the Arboretum: Witch-Alder

Oct 9, 2026

Fall foliage close-up of a witch-alder in the Arboretum's Woodland Garden. (Photo by Niall Dunne)BY PHIL WOOD As a retired garden designer, I am always on the lookout for plants that offer multiple seasons of interest. Witch-alders (Fothergilla species and hybrids)...

Volunteers Help Host First Seattle Botanic Gardens’ Plant Sale

Sep 24, 2026

Volunteers helping shoppers at check-out in the Big Greenhouse. (Photo by Polly Teeter)BY ALICIA HAMILTON Our annual Fall Plant Sale took place at the Graham Visitors Center in the Arboretum last Saturday, September 19. Though it happened on a single day, the sale was...