One would think Birch trees, but considering there are no Birch trees in Glitch, it must come from some other type of tree, or be imported from a far off land.
If it comes from one of the trees that currently exsist in the Glitch world that we know of, there must have been someone who knew how to tap the trees (in which case i'll have to find him and have him teach me his ways!).
If it is imported from a far off land, Uncle Friendly must be able to place an order for some Maple, if there is enough demand! Right?