Answer: Most of the bulbs that bloom in the early spring such as crocus, daffodils and tulips are planted as bare bulbs in the fall and left in the ground from year to year. Most summer bulbs, corms and tubers are planted in the spring. Hardy perennial bulbs such as lilies (lilium) are left in the ground from year to year. Cannas, caladiums, dahlias, and tuberous begonias are planted in the late spring and later dug up and stored for the winter. Most gladiolus varieties are planted at intervals through the spring and early summer to provide sequential bloom in the summer. These are also dug each fall. In your area, Acidanthera is grown as an annual bulb and is planted in the spring for bloom in the fall, then abandoned to freeze. There are many bulbs, as you may have guessed. You might want to read up on them a little bit. One book I like is "Flowering Bulbs for Dummies" by Judy Glattstein, ISBN 0-7645-5103-5.
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