Answer: There's about an 80 percent germination rate for Prunus seeds, so you have a reasonable chance of having some plum trees actually sprout from the pits. The hard outer coating will delay germination until the seed inside can absorb moisture. You can hurry things along by nicking the seedcoat (being careful not to damage the seed inside). Plant the seeds outdoors in the fall, or refrigerate and plant outdoors in the spring. (Seeds will need 90-150 days of cold to break dormancy.) Plant seeds 1-2" deep. Expect germination in 90 days if planted in the fall and 120 days if planted in the spring. Good luck with your plum trees!
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