Answer: There are two primary reasons most people don't try to grow their own trees and shrubs form seed. The first is the long time it takes to get them to an acceptable size. The second is the fact that some plants (shrubs especially) are special varieties which must be rooted from cuttings, grafted or budded as they will not reproduce true to form from seed.
Here are sources of a wide variety of tree and shrub seeds:
Lawyer Nursery, Inc., 950 Hwy 200 West, Plains, MN 59859 (406) 826-3881, Fax (406) 826-5700.
SBE Seed Co., 3421 Bream St., Gautier, MS 39553; 1-800-336-2064 Fax: 228-497-6544; http://www.datasync.com/sbe/seedbank.html
Thanks for the question!
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