I have a couple of mublberry tree cuttings which seem to be growing to
quickly for their own good the weight of leaves are making the main
stem bend downwward then the tip of course tries to grow up so the
thing looks like an S on its side.

Should I cut it back? feed in more/less? they ares in pots at the
moment. I don't want to tie it up because that might make the problem
worst or is that the best solution until it loses its leaves.

Regards
Bruce