You might want to check with your local county extension office (or the
equivalent if you are not in the US). They are great with this kind of
question. I also suggest you let us know what part of the world you are
living in and maybe those who know would also want to know what kind of
holly you have?
I am just trying to keep mine alive and get the healthy, but then I am
not in an area that hollies like.
Good reference group is rec.gardens.
Holly in Georgia is likely grows over much of the year, but mainly in the
spring and early summer. Generally, I trim hedges any and all times of the
year. You get much better shape and privacy effect if you trim them
frequently. I do mine every quarter. Basically do one severe trim to the
shape you want. That will shock the plant and it will take awhile to
recover, but from then on trim every few months during the long growing
season, and all the unevenness and holes will fill in, and subsequent
trimmings will be minor, and the holly will thank you for it.
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