If you are able to get maple seeds straight from the tree or are still soft and green they can be sown right then and will grow. I
Quite old this post……. But I’ll give it a try I’m going to grab a handful of these trident maples and soak them in kelp overnight and maybe the gibberellins in the kelp will get them Poppin instantly……. Normally would probably be a Harvest about a month from now the samaras are just starting to get a red tinge and then I imagine a 1 to 2 month stratification would get them popping but we’ll see one way to find out the tree is not going nowhere and it’s loaded with seed.
I picked the one that is growing in the most sunshine to full sun and quite a very hot area of zone 7A in southeastern Pennsylvania.
Experience has taught me if you start these in a grow tent it has to be extremely low light like cutting strength and then after they got strong roots then you can ramp up the light strength……. After all they are looking at an 18 hour light cycle!!!