Division of perennials may be necessary when the side shoots or runners become crowded by other plants. Aggressive varieties, such as Shasta daisy, Oriental poppy and aster, often need dividing every three years. Others can go longer before division is necessary. Spring and early-summer blooming perennials, such as peonies and poppies, are usually divided in the fall or when foliage dies (mid-September through mid-October). Plants that flower in mid- to late summer and fall, such as chrysanthemums and asters, should be divided in the spring before growth begins. Iris and daylilies usually are divided immediately after flowering. For more information please see the fact sheet "Perennial Gardening."
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