As fast-warming winters encourage early blooms, they also risk exposing the trees to damage from cold snaps that remain common into March.
encourage early blooms, they also risk exposing the trees to damage from cold snaps that remain common into March at the mid-latitudes where the ornamental cherry trees have long thrived. A close call is in the forecast this weekend, with temperatures possibly dropping into the upper 20s in Washington.
It isn’t the only threat climate change presents: Come summer, hot and muggy nights make it hard for the trees to repair themselves. All year round, floods inundate their roots with salty water.Late freezes threaten early blooms While hibernating for winter, the trees keep track of how long temperatures spend below about 45 degrees. Once the weather starts to warm, though, they start another count, Walsh said, gauging whether it’s safe to begin growing again based on how much temperatures rise.
The Tidal Basin blossoms were on the verge of a mid-March peak bloom, almost two weeks earlier than average, when temperatures dropped into the lower to mid-20s on back-to-back mornings. ThatWhen temperatures remain that cold for several hours, it harms the blossoms if the buds have begun to flower. Even colder temperatures, as well as sunlight reflecting off snow cover, can also damage cherry trees’ bark and internal tissue, Walsh said.
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