You can do bottomless rootmakers like Mark and I.
Works really well as it's no dig either. Now maybe the maple roots will grow up though like mentioned. Could you take out the maple trees?
I have some decent sized trees about 20' from the greenhouse and I plant to cut them out this winter cause of shade issues.
Yeah, the maple tree is 70 years old, shades the greenhouse in our hot cloudless summers, and houses all sorts of wildlife. We did cut down 3 fir trees to put in the greenhouse, so I just don't have the heart to kill "Mabel". When the arborist says she's on the way out then we'll do it.
And yes, I guess the roots would grow up into any raised beds, and probably rootmaker pots, although the pots are a good option. There is about 6 inches of bark on the floor that has been decomposing over the years, and I noticed Mabel's roots have come up through that.
Heavy sigh.
Carolyn