Crazy for Colchicum

Fall is prime time for a carefree and surprising bulb

Tom Weaver —  September 25, 2013 — 2 Comments

When most people think of bulbs, they think of spring-flowering plants such as tulips and Narcissus, or maybe summer ones such as Allium or lilies. One often-forgotten season is fall, even though fall is prime time for one of the most carefree and surprising bulbs of all, Colchicum.

PHOTO: Colchicum 'Waterlily'

Colchicum ‘Waterlily’

Commonly known as autumn crocus or meadow saffron (although it is important to note that they are neither saffron nor a crocus and are poisonous if ingested), these lovely ephemerals are jewels in the fall garden.

Get your own Colchicum bulbs (and more!) at the Fall Bulb Festival, October 4 – 6.

PHOTO: Colchicum cilicicum

Colchicum cilicicum

PHOTO: Colchicum autumnale 'Album'

Colchicum autumnale ‘Album’

Although they’re commonly referred to as a bulb, Colchicum are not a true bulb, but are corms, much like Gladiolus and Freesia. Colchicum have an unusual habit of growing their foliage in the spring (just like most plants), but then instead of flowering, they go dormant for several months. Then, seemingly out of nowhere, they send up dozens of purple, pink, white, or checkerboard flowers just as the rest of the garden is getting ready for fall.

Colchicum prefer a location with full sun until midspring and grow best in a location with well-drained soil that does not stay wet during the summer dormant period. This makes them ideal for planting under trees, where other plants might not compete as well with the roots. The bulbs should always be planted two to three times deeper than the bulb is tall to help ensure a long life.

To appreciate these intricate flowers, plant Colchicum in large groups near the front of a border. Because the foliage remains green until early summer, it is best to either plant them in an area with a groundcover, or to choose a low-growing annual to plant over them once the foliage has gone dormant for the season. This not only hides the bare ground, but also provides some support to help keep the flowers upright.

Look for Colchicum at the Chicago Botanic Garden beginning in mid-September and continuing through October. The Bulb and Home Landscape Gardens have the best displays of this fall beauty.

PHOTO: Colchicum 'Violet Queen'

Colchicum ‘Violet Queen’

PHOTO: The Home Landscape Garden, dotted with clusters of Colchicum 'Violet Queen'

A large planting of Colchicum ‘Violet Queen’ in the Home Landscape Garden


©2013 Chicago Botanic Garden and my.chicagobotanic.org

Tom Weaver

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Tom Weaver is a horticulturist and takes care of the dwarf conifer garden and waterfall garden. He has a bachelor's degree in environmental horticulture from the University of Minnesota, Twin Cities Campus. His favorite groups of plants are hardy cacti and anything with chartreuse foliage.

2 responses to Crazy for Colchicum

  1. Informative and well written!

  2. I never have thought about planting fall bulbs. These are so nice.
    One question. We have a couple of pets, a dog and kitten. You say the Colchicum are poisonous, are animals attracted to them so that they try a munch and get sick? I just want to know before trying to plant them that I won’t be killing the animals.

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