Slippery Elm -Ulmus rubra
Deciduous tree native to Central, Eastern and Southern United States and Canada. Excellent shade tree, Slippery elm prefers part shade to sun and good water, drainage, and a limestone soil. Seed from the new harvest is sown in the early summer. 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.
Images courtesy of the Ohio Department of Natural Resources
Planting & Care
Soil & Water: Slippery elm prefers part shade to sun and good water, drainage, and a limestone soil.
Planting & Growing: Sow seeds in deep pots or plug trays. Sow ten seeds per pot and separate after germination or thin to the best seedling. Sow on soil surface and cover with 1/4 inch of soil, tamping securely and keep evenly moist, cool (70 degrees) and in the shade until germination occurs (about 30 days). If flats are left outdoors for an entire year, more germination will occur the following spring.
Harvesting & Storage:Harvest of bark is done before April or after June. Allow to dry until hard and brittle.