NPS Photo of arrowleaf groundsel, a common subalpine wildflower, and a hoverfly pollinator at Sunrise.
The blooming of Mount Rainier's gorgeous wildflower meadows is linked to the amount of snow on the ground. While this year the mountain had some late spring snow, pushing peak bloom into mid-August, last year the meadows melted out very early due to a heat wave. Changes in melt timing can affect how well young plants survive. Earlier snow melt can result in less soil moisture later in the season, making plants vulnerable to prolonged drought. Not all pollinators are tied to snowmelt but are active later in the summer. They may be too late to pollinate the blooms of their preferred flowers if the flowers bloom earlier in the season. This could mean that some wildflower species miss out on the chance to reproduce. Each meadow species responds differently, and wildflower season may end up stretching out, moving toward a time in which the 20-species-blooming-at-once-in-Paradise pictures are no longer possible.
NPS photo of numerous wildflowers blooming together in a subalpine meadow around Tipsoo Lake.
The University of Washington MeadoWatch program is a long-term citizen science program to track wildflower phenology in Mount Rainier’s meadows. Volunteers hike two routes, one near Reflection Lakes and the other in Glacier Basin, and note the species of wildflowers and their lifecycle stage, from budding to blooming to seeding, at certain points along the trail. The observations are repeated multiple times each summer and over multiple years to build a long-term data set used to understand the impacts of climate change in Mount Rainier National Park. To learn more and participate visit www.meadowatch.org.
NPS Photo of a MeadoWatch surveyor noting wildflower species at a location along a trail.
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