Put the mimosa seeds in a paper or cloth bag and store them until spring in a cool, dry location. Avoid using a plastic bag as it will trap moisture and cause the seeds to rot.
Mimosas attract hummingbirds, butterflies and bees to the landscape, but in some regions, they’re considered to be extremely invasive and difficult to eradicate once established. Before you plant mimosas in your yard, contact your local county extension office to find out if they’re invasive in your area.
Watch for germination one to three weeks after sowing. Grow the seedlings under the same conditions as during germination until they reach 3 inches in height and produce several mature leaves.
Fill individual 5-inch biodegradable pots with a lightly moistened mixture of half sand and half loam. Sow one seed in each pot at a 1-inch depth. Spread a 1/4-inch-thick layer of sand over the soil.
Gather mimosa tree pods in autumn after the pods darken and dry out. Snip the ends off with heavy shears. Pry open the pods and shake out the flat, dark-brown seeds.
How to Grow a Mimosa Tree From a Seed
Valued for their fragrant pink flowers and airy foliage, mimosas or silk trees (Albizia julibrissin) are a subtropical species of deciduous tree widely grown throughout U.S. Department of Agriculture plant hardiness zones 6 through 9. They produce an abundance of long, pealike seed pods year-round, which may be harvested in autumn and used to propagate new trees. Mimosa seeds germinate quickly in warm conditions and will put on approximately 36 inches of growth each year. However, the hulls of the seeds are very hard and must be processed before sowing to ensure successful germination.
Photo by Ira Heuvelman-Dobrolyubova/Moment/GettyImages
Carefully monitor the moisture level of the soil. Water to a 2-inch depth whenever the top 1/2 inch of soil dries out. Avoid overwatering or letting the soil dry out completely, which will cause the mimosa seeds to fail.
Although mimosa trees are easy to grow from seeds, the seed hulls are very hard and must be processed before sowing to ensure successful germination.