There are very few plants that do NOT form some sort of mycorrhizal relationship......maples are no exception.

Thanks GG! I also grow carnivorous plants and they don't form a symbiotic relationship with myco so just wondering.

It is true that Acers make an association with mycorrhizal fungi, but there is no reason for you to buy the fungi if you are growing the tree in the garden.

Here is a link that might be useful: GardenMyths: mycorrhizal fungi

Thanks!