Answer: Most perennials do well with deadheading, or removal of the spent flower stems. They also appreciate several inches of organic mulch year round placed around but not touching the crown. The mulch will help keep down weeds and help the soil stay cool and moist. You might water them as needed to keep the soil moist but not soggy -- the rule of thumb is an inch a week from the hose or the sky applied in a deep slow soaking rather than in daily light sprinklings, but check the soil with your finger to see if it is necessary or not. In late fall after frost browns the stems, trim them off. That's really about it. Some plants have specific do's and don'ts but for the most part care is pretty straightforward.
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