Peak bloom predictions are in for UW’s cherry trees
Our take
Spring is an exciting time in the Pacific Northwest, especially for those who call Washington home. The arrival of cherry blossom season at the University of Washington signifies not just the changing of the seasons but also a vibrant community gathering that attracts visitors far and wide. This year, the UW’s iconic Yoshino cherry trees are set to reach their peak bloom around March 20, a date eagerly awaited by locals and tourists alike. The cherry blossom display is not just a feast for the eyes; it’s a reminder of the beauty of nature and the importance of communal experiences. In a world where we often feel disconnected, these blossoms foster a sense of belonging that resonates deeply within the community.
The cherry trees on the UW Quad have become a cultural fixture, drawing large crowds to admire their stunning display. This annual phenomenon ties into broader themes of community and connection. As people gather to witness the beauty of the blooming trees, they engage in conversations, take photos, and create memories. This experience mirrors other significant events happening on campuses across the country, such as the recent court ruling that reinstated a Texas State professor or the ongoing legal battles faced by students in Kentucky regarding new state laws. These events highlight the importance of advocacy and community involvement, reminding us that we are all part of a larger narrative that shapes our educational environments.
The cherry blossoms also serve as a perfect backdrop for reflection. In today’s fast-paced world, where we juggle responsibilities and navigate the complexities of life, taking a moment to appreciate something as simple yet profound as cherry blossoms can remind us of the beauty in our surroundings. It’s a time to slow down, breathe, and perhaps even reconnect with ourselves and those around us. This year, as we anticipate the peak bloom, let’s also think about our own growth and the connections we nurture. Just as the cherry trees flourish, we too can strive for personal growth and meaningful relationships.
Moreover, the cherry blossom season is an opportunity for local businesses and organizations to engage with the community. From food vendors to art displays, the influx of visitors creates a lively atmosphere. This is vital for local economies and fosters a sense of pride among residents. The cherry blossom display is more than just a seasonal event; it’s a catalyst for community engagement and support. As we celebrate this natural wonder, let’s also consider how we can contribute to our own local ecosystems, much like the UW researchers deciphering beluga calls for conservation efforts. It’s about finding our place within the larger community, whether that’s through environmental stewardship or simply enjoying the beauty of our surroundings.
As we look forward to the cherry blossoms blooming this March, let’s also reflect on the connections we forge and the communities we build. How can we take this opportunity to engage more meaningfully with our peers and the environment around us? The arrival of spring and the blooming of cherry blossoms is not just a visual spectacle; it’s a call to action for all of us to nurture and celebrate the bonds that make our community stronger. As we step into this new season, let’s make a conscious effort to embrace the moments that matter, both big and small.
Each spring, large crowds gather on the University of Washington Quad to admire 29 puffy pink cherry trees making their seasonal debut. The trees begin to wake up as the weather warms, and this year, estimates suggest that they will reach “peak bloom” on March 20.
The UW’s iconic cherry trees achieve peak bloom when 70% of the blossoms have opened, but the week before and after still offer visitors an optimal viewing experience.
The cherry blossom visitors’ website provides updates on bloom status as well as details on transportation, activities and amenities. The cherry blossoms also have live video feeds for virtual viewing and their own social media accounts on Instagram and BlueSky.
The cherry trees are both beautiful and ecologically significant. Tracking when the buds burst each year helps researchers predict peak bloom and determine how climate warming is impacting the trees, which were planted in the Washington Park Arboretum in 1936 and then relocated to UW in 1962.
This year, many plants began to emerge early as a mild winter gave way to spring. Recent UW research described how plants rely on both temperature and light cues to time their flowering. Temperature is particularly important to cherry trees, which estimate the arrival of spring based on how cold it has been. They accrue “chilling units” as winter progresses and “heating units” as it yields to spring.
“The buds need to accumulate a specific amount of chilling units before they can start accumulating the heating units. When it is not as cold, the chilling units accumulate much slower, so it takes them longer to wake up from dormancy, which is very counterintuitive,” said Marlee Theil, a UW doctoral student of environmental and forest sciences.
Theil is now overseeing data collection on campus, with the help of approximately 20 undergraduate students. The researchers make observations as the trees begin to wake up and feed the data into a computer model that incorporates weather forecasts to predict peak bloom.
Historically, the onset of peak bloom has fallen between March 12 and April 3, with an average date of March 23. While the weather impacts peak bloom year to year, climate change drives longer term trends over multiple decades.
Research published last summer shows that bloom time has shifted approximately two days earlier each decade since the 1960s. Researchers began monitoring the trees in 2012 and referenced newspaper archives to estimate peak bloom dates for the preceding years.
“With the climate warming more rapidly in the spring, I expected to see the flowers blooming earlier,” said lead author Autumn Maust, a recent doctoral graduate from the UW school of environmental and forest sciences. “But as we dove into the literature and examined the data, we saw a delay in bloom, as a result of winter warming in Seattle.”
The study focused on the Somei-yoshino, or Yoshino, cherry tree cultivar. These trees, sometimes called the Japanese flowering cherry, are found throughout Japan. They also line the National Mall in Washington D.C. and paint many Seattle neighborhoods pink in the springtime.
The bloom delay Maust observed applies only to Yoshino cherry trees in Seattle. In colder climates, such as Washington D.C., the trees have ample time to accrue chilling units. Still, the two populations are quite similar, genetically.
Propagation, or breeding more trees, occurs by grafting one tree onto another. This process limits genetic variability in favor of consistency. Because all Yoshino cherry trees are sterile clones of one another, they do not produce fruits or seeds, but they do reliably bloom in beautiful pink hues each spring.
Even so, there is still enough variation between trees in different places to trace their history. To figure out where the UW’s trees may have come from, UW researchers and students sequenced their DNA. They compared the results to Yoshino cherry trees at sites throughout Japan and found a cluster of close relatives, with approximately 85% genetic overlap, near Shimane University in the city of Matsue.
The work, led by Adam Steinbrenner, a UW associate professor of biology, sheds light on the origin of the trees, some of which may be nearly 100 years old.
For more information on bloom time, contact Theil at mtheil@uw.edu or Maust at amaust@uw.edu. For information about the Yoshino Genome Project, contact Steinbrenner at astein10@uw.edu.
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