If your perennials are planted in a well-prepared soil, heavy fertilizing programs will not be necessary. Perennials will benefit from a single spring application of an organic or granular fertilizer. For an organic fertilizer, we recommend Plant Tone, or Garden Tone. Granular fertilizers that are appropriate include 5-10-5, 10-10-10 or superphosphate. Apply these fertilizers at the rate of 1½ to 2 lbs. Per 100 sq. feet. At the end of the season, cut herbaceous perennials to the ground, since they will regrow from the root in spring. Avoid cutting any plants with woody stems. Removing dead foliage and debris will reduce the onset of diseases and pests the following growing season.