Answer: According to Michael Dirr's Manual of Woody Landscape Plants, the seeds do require a cold stratification period of 60 to 90 days before they will germinate. One way to provide this is to plant them outdoors in the fall where you want the tree and hope they germinate naturally the following spring. Another way to provide this under somewhat more controlled conditions is to place the seeds along with some barely damp sand or vermiculite or milled spagnum peat moss enclosed in a plastic bag, label and store it in your refrigerator for the required period of time. Plant immediately after the chilling treatment. This provides a temperature of about 41 degrees which should do the job of simulating the needed winter chilling period. Good luck with your experiment!
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