These are just about the easiest perennials to grow. Plant Chrysanthemums when all danger of frost is over. They like well drained, fertile soil in a sunny position. They tend to be susceptible to mildew and require plenty of space for air circulation, so ensure that you plant them 18 to 30 inches apart.
Chrysanthemum are tough and can survive on their own, but benefit from light and frequent feeding of a balanced fertilizer during the growing season. Removing the top growth and taking it down to three or four leaves up from the base of the plant promotes the formation of side shoots and you’ll create a bushier, more flower-productive clump.