Box balls question
I have 10 Boxwood 'Green mountain' in containers and 4 in the ground.
They're 14-20" high and have never been trimmed.
My question is, do I shear them down to ball shape all the way,
leaving only the small cavities resulting from uneven growth,
or do I approximate the ball first, trimming roughly,
and refine the shape over a period of time. If the latter, how often?
Hope one of you experts out there have an answer,
Thanks in advance!