Slippery Elm (Ulmus rubra) seed
Hardiness: -40 degrees F
Deciduous tree native to Central, Eastern and Southern United States and Canada. Excellent shade tree, perfect antitussive and throat-soothing mucilage producer. This is the species that yields the famous mucilage-laden medicine known as "slippery elm bark" which is actually the spring-stripped inner bark of the mature tree. Slippery elm prefers part shade to sun and good water, drainage, and a limestone soil. There's alot of information about this tree in my book "Growing at-risk," so please read that. Seed from the new harvest is sown in the early summer. Our experiments show first signs of germination at day 20, with 23% germ on day 24, and 30% germ by day 30. Optimal germination temperature is 70 degrees F (21 degrees C). More germination will occur the following spring. 100 seeds/pkt
Images courtesy of the Ohio Department of Natural Resources
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