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Elisabeth C. Miller Library

Keyword: University of Washington

University of Washington Herbarium

“The University of Washington Herbarium (also known as WTU) is an international resource for research into the diversity, distribution and ecology of Pacific Northwest vascular plants, non-vascular plants, fungi, lichen, and algae.”

UW cherry tree blossoms

I would like to know when most of the beautiful flowering trees will be in bloom on the University of Washington campus this spring? I would like to bring a tour group to see them.

Typical bloom time for the Yoshino cherry trees (Prunus x yedoensis) in the Quad is mid- to late-March, but timing is weather-dependent. You can check the UW Cherry Cam, which they update each spring: https://www.washington.edu/video/campus-webcams/

This article shows the stages of flower development and provides additional detail about the factors affecting bloom time. Here is another article about research into predicting bloom time.

Excerpt:

“The timing for peak bloom — meaning 70% of buds have emerged — varies each year based on weather conditions that the developing buds are exposed to in January, February and March.

“”‘In order to reach peak bloom, buds need to accumulate a certain number of both cold and warm days, known as ‘growing degree days,’ said Marlee Theil, a UW graduate student in the School of Environmental and Forest Sciences.”

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Otis Douglas Hyde Herbarium

The Hyde Herbarium (WTUH), collects and houses voucher specimens of all accessioned plants in the Washington Park Arboretum and the Center for Urban Horticulture, horticulturally significant plants, and plants that reflect the research and project efforts of faculty, staff and students at CUH and WPA.