The mechanism by which drought can cause flowering is uncertain, but some research suggests that it’s linked to stress-induced dormancy that helps plants preserve energy, similar to their experience during winter. Longstroth speculates that stress during early August can be particularly influential in causing unusual fall blooms. ![]() Longstroth points to drought as the major trigger.ĭuring July and early August, Ohio and New Jersey - the locations of Cash and Goldman’s crab apple trees - were experiencing abnormally dry conditions, according to the U.S. This phenomenon is most common in the northern U.S. Mark Longstroth, a fruit educator at Michigan State University Extension, has seen occasional fall flowering throughout his 45 year career of observing apples, he said. When spring breaks the plant’s dormancy, the buds burst open and bloom.īut sometimes, plants bloom out of season. Many trees and shrubs that flower in early spring, like apples and lilacs, form their buds during the preceding summer. Drought may trigger out-of-season blooming And gardeners may need to take more care to protect their plants. That stress could cause more plants to bloom in the fall and fewer buds to open in the spring. But observations of out-of-season blooming were also shared on ISeeChange from North Carolina, which experienced a wet summer.Īs climate change brings more heatwaves, droughts and heavy downpours, plants are experiencing additional stress. The majority of those reports came from the Midwest and Northeast. This year, according to Director Theresa Crimmins, the network received more reports of open flowers on lilacs and apples in September and October of 2020 than in all previous years of data collection going back to 2010. The USA National Phenology Network collects, stores and shares information about the timing of biological events of plants and animals - like first leaves and migration. The big seed heads continue to provide interest and texture after the blooms have faded.Overall, much of this unusual fall blooming did happen in regions with drier late summers this year. ‘The President’ produces huge, deep bluish violet flowers in late spring and early summer, with a second flush in autumn.‘Daniel Deronda’ is a fall flowering clematis that produces gigantic, purple, star-shaped fall flowering clematis blooms in early summer, followed by a second flowering of somewhat smaller flowers in late summer through fall.This late-blooming clematis puts on a show throughout summer and fall. ‘Madame Julia Correvon’ is a stunner with intense, wine-red to deep pink, four-petaled blossoms.This variety is valued for its unique colors – burgundy with pink ruffles in the center. ‘Avante Garde’ puts on a show in summer and provides big, gorgeous blooms well into autumn.Yellow stamens provide contrast for these pale, 6 to 8 inch (15-20 cm.) blooms. ‘Silver Moon’ is appropriately named for the pale silvery lavender flowers that bloom from early summer to early autumn.Each petal is marked with a distinctive, dark purple stripe. ![]() ![]()
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