Blooming

"Dead-head"—that is, remove old flower heads—after blooming unless the fruits are ornamental. This prolongs the flowering period of many perennials, especially dianthus, coreopsis and shasta daisy.

A few species will bloom a second time if the stems are cut back after flowering. Examples are del phinium, false indigo and globe thistle. The flowers won't be as numerous on the regrowth, but cutting back does result in a longer, although not continuous, flowering period.

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