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Plants of the Eloise Butler Wildflower Garden

Common
Name

Scientific
Name

Plant
Family

Garden
Location

Prime
Season

Kentucky Coffeetree
Gymnocladus dioicus (L.) K. Koch
Pea
Woodland
Spring flowering, seed pods in Autumn lasting to following spring.
Other names and notes

A tall (up to 70') tree with a narrow open crown. Leaves are large bipinnately compound, 12 to 30" long. Flowers in the spring are small greenish-white arranged in upright terminal clusters. The autumn fruit is a large (4 to 7" long, 1 to 2" wide) thick dark red-brown pod that may stay on the tree over winter, but if it drops in autumn, it does not open then to disburse the seeds. The seeds are 3/4" bean like rounded seeds.

The generic name is Greek and means "naked branch" as the tree appears to be dead when it is not in leaf. It leafs out late and drops leaves early. The common name comes from the seeds which were an early coffee substitute when roasted, but are considered somewhat poisonous (as are the leaves) when not roasted. It is a superior tree for the home landscape as it is not known to be susceptible to disease or insects in this area. The Minnesota Landscape Arboretum introduced a cultivar in 1996 that is a male without the seed pods and is considered a superior shade tree.
Kentucky Coffeetree seed
Kentucky Coffeetree
Above: The seed pod. Below: Priors year's seedpods still on the tree in early May - don't mistake them for birds! Photo far below-in December.
Kentucky Coffeetree
Kentucky Coffeetree seed pods
Tree Bark
 
Kentucky Coffeetree
 
Notes: This tree first made it's appearance in the Garden in May 1909 when Eloise Butler planted some selections received from the Park Board. Martha Crone planted 36 small ones in 1934 that had been acquired the previous fall and heeled in for the winter. A number of these still are growing in the Woodland Garden in the vicinity of Guidebook Station 10. It is native to Minnesota in some south central counties and several counties in the SE near the Mississippi River. It is not native to Hennepin County where the Garden is located.  
 

 
References: Plant characteristics are generally from sources 15, 16, 30, 31, 33, W2 & W3. Distribution principally from W2 and also 31, 34 and W1. Planting history generally from 1, 4 & 4a. Other sources by specific reference. See Reference List for details.  
©2008-2012 Friends of the Wild Flower Garden, Inc. All photos are the property of The Friends of the Wild Flower Garden unless otherwise credited. "www.friendsofthewildflowergarden.org" 120211