Answer: Sweet Alyssum is an annual plant that blooms early in the spring, and on into the summer if the weather isn't too hot. Snow Crystals should be tolerant of some hot weather, though so what you're probably seeing are the spent flower spikes. If you cut your plants back, you'll force a second flush of bloom. Alyssum does freely self-sow, so expect to see some new little plants in the garden bed, especially next spring.
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