In article , leylandii
writes

My Dad has some 7-8 ft leylandii that were cut back a couple of years
ago and have never grown back properly. A local "tree person has said
he can cut them back again and spray them with something that will make
them grow back. Is this possible? Or just a con to get some money out of
the old boy.


That sounds like a con. Leylandii don't grow back once you've cut back
past the green.
--
Kay
"Do not insult the crocodile until you have crossed the river"