Small trees - move from pots?
My husband & I have several trees we got from the Arbor Day Foundation. We put them in 5 gal pots last year and they are doing really well. We were planning to plant them in the ground this fall, but my husband says he wants to wait until they get a little bigger.
Question - can I take them out of the pots, add more soil/rocks to the bottom, and put them back in to allow for more growth? The pots are only 60% full so adding more soil to the bottom would give a couple more inches for roots to grow?
FYI - if it helps, the trees are redbud, flowering crabapple & washington hawthorne.