Answered in your earlier post.

Yes, the trouble is, Rosierose, there were two conflicting answers, so I repeat, as soon as it needs it (when it looks long) but don't cut it shorter than two inches high until its been down more than six weeks.

I just saw that there were two identical posts and that one had answers and this one didn't. I didn't actually read the replies. I simply wanted to let Karen know that her query had been answered, in case she was unaware.