A common gardening question is, "How can I make sure my [insert
the flower in question here] are blooming in time for my outdoor wedding?" As
you’ve probably observed, many plants have a specific bloom period that may last
weeks or even months, but that is consistent from year to year. Daffodils bloom in the
spring, garden phlox in midsummer, and asters in the fall. It’s tempting to say that it just takes longer for aster
flowers to develop than for phlox flowers to develop. But compare the low-growing,
spring-blooming Phlox subulata with the taller, summer-blooming garden phlox, Phlox
paniculata. Here are two plants with similar flowers, but they bloom months apart.
For many plants, especially those native to temperate
regions, the onset of flowering is closely tied to day length.
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