If the seedlings are still not large enough for out-planting, they should be thinned again or transplanted to provide more growing space. If you decide to transplant the seedlings, put them into rows about 8 inches apart with 3 inches between seedlings in the rows. If you would like to grow some conifers in your home, follow the same procedures for collection, storage and stratification. Garden soil should be sterilized to prevent damping-off problems. Most packaged potting soil mixes have been pretreated and do not need sterilization.
Full sun is needed for conifers grown indoors.
A south window would be best. U.S.D.A. Agriculture Handbook 450. It can be ordered from the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402. Kenneth R. Bolen, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources.