Most Japanese Maple seeds ripen in the fall. Watch the tree and wait for the seeds to turn brown. The seeds are ready to be harvested when they are brown and can be easily removed from the tree.
The seeds are attached to a wing, it’s best to break the wing off before storing or planting the seeds. Japanese Maple seeds have a very hard outer coating as do many ornamental plants. Under natural conditions the seeds would have to be on the ground for almost two years before they would germinate. All that happens the first winter is the moisture softens the hard outer shell, and the second winter germination is beginning to take place.
In order for all of this to happen in the proper sequence so the seedlings actually sprout at a time of the year when freezing temperatures or hot summer sun doesn’t kill them, takes a tremendous amount of luck.
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