The message
from "Snowman" contains these words:

I might be being a bit dim, but if you cut them by a third, would you not
then be cutting into old wood? Surely you need to cut into old wood to get
the height reduced over time?

I think she means - don't expect new growth on branches etc from which
all the foliage has been removed.

--
Rusty Hinge
No m'lud, it wasn't a sneg. My joints creak.