During their blooming period, water the plants once a week if they do not receive an inch of rain that week.
When bloom slows during the summer, trim the whole plant back by about one fourth of its height. Water thoroughly. Rebloom will occur within 2 to 3 weeks.
Apply a complete fertilizer (16-4-8) in mid- to late spring and again after trimming back.
In the fall, you can trim back the plants lightly to give them a neater appearance, but do not cut severely until spring, when new growth begins to appear.
Some varieties will re-seed and naturalize in the garden.
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