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Horticulture and Home Pest News
Horticulture & Home Pest News is filled with articles on current horticulture, plant care, pest management, and common household pests written by Iowa State University Extension specialists in the Departments of Entomology, Horticulture and Plant Pathology.

Late Summer and Fall-blooming Bulbs

This article was published originally on 7/30/2004

Spring-flowering bulbs, such as tulips and daffodils, are familiar to all gardeners. Though not widely planted, the attractive flowers and unique life cycles of the colchicum, showy crocus, and magic lily make them welcome additions to the garden.

Colchicums (Colchicum spp.) arise from bulb-like corms. The leaves of most colchicums emerge in early spring and die back by early summer. White to pink to purple crocus-like flowers appear without foliage in late summer or fall. They also are known as autumn crocuses.

Colchicums should be planted immediately upon receipt in late summer or early fall. (If not planted immediately, the corms often bloom during storage.) Plant the corms in well-drained soils in full sun to partial shade. Good planting sites include naturalized areas under the filtered shade of large trees and shrubs, in rock gardens, or amongst low-growing groundcovers such as sedum. For the best visual display, plant colchicums in clumps. The corms should be planted 2 to 3 inches deep and 6 inches apart.

Gardeners can choose from several excellent cultivars. 'Album' produces pure white flowers. 'Alboplenum' has double, white flowers. The flowers of 'The Giant' are 10 to 12 inches tall and violet with a white throat. 'Lilac Wonder' bears large, rosy-purple flowers. 'Waterlily' produces double, lilac-pink flowers that resemble a water lily.

Colchicums are native to Europe and northern Africa. The scientific name comes from Colchis, an ancient country bordering on the Black Sea, now part of the Georgian Republic, where colchicums are abundant.

The dried corms and seeds of Colchicum autumnale are the source of medicinal colchicum. It is also the source of colchicine, which is used in plant breeding to induce polyploids.

Another attractive fall-blooming bulb (actually a bulb-like corm) is showy crocus (Crocus speciosus). Flowers are violet-blue with yellow anthers and deep orange stigmas. Plant height is approximately 5 to 6 inches. Excellent cultivars include 'Albus,' which produces white flowers, 'Cassiope' has aster-blue flowers with yellow bases, 'Conqueror' produces clear, deep blue flowers, and 'Oxonian' has large, dark blue flowers. Showy crocus blooms in late September or October.

Showy crocus performs best in partial to full sun in a well-drained soil. Possible planting sites include rock gardens, naturalized areas, and perennial borders. Plant the corms 3 to 4 inches deep in groups of 25 or more.

Another intriguing plant is Lycoris squamigera. Common names include magic lily, resurrection lily, surprise lily, and naked lady. The life cycle of Lycoris squamigera is similar to most colchicums. The long, strap-shaped leaves emerge in the spring, but die back to the ground by early summer. Pink, lily-like flowers are borne on 18- to 24-inch-tall, leafless, flower stalks in mid to late summer. Each flower stalk produces 4 to 12 flowers.

Lycoris squamigera performs best in partial shade to full sun in well-drained soils. Plant bulbs 4 to 5 inches deep and 6 to 8 inches apart. Since the dying foliage is rather unsightly, interplant the magic lily with other perennials.

The brightly colored flowers of tulips, daffodils, crocuses, and other spring-flowering bulbs are a beautiful sight in the garden after a long, dreary winter. However, when selecting bulbs for the garden don't forget the attractive, intriguing, late summer and fall-blooming bulbs.



This article originally appeared in the 7/30/2004 issue.

Year of Publication: 
2004
Issue: 
IC-491(19) -- July 30, 2004