I was driving home from a mates place this arvo when i noticed a bunch of little trees growing on the side of the road roughly 5kms out of town.
After closer inspection I realised that they are a crabapple. In total I found 5 some bigger than others but all a fairly good size. This one for example was
maybe 2.5m high and about maybe 40cm around the base of the trunk. From What I have read and seen these make great bonsai so I guess my question is
when is the best time to dig something like these up and how far can I cut them back if or when I do.

Any comments are welcome.
Damian