Can refer you to a video I watched last night,
I dont use colanders, but I do tend to pick up material that already has decent root systems which I would then place on a tile in the ground. some tidy up or trim back roots in the ground every so often, but I dont usually do that I just plant them and dig them up when theyre ready to be dug and do the roots then.
Sometimes ill pick up young nursery trees, slice a bit off the bottom and put it in the ground as is, just teasing out a little of the surface roots. they establish quickly and have an abundance of root to power strong growth.