I have, what I believe, to be a Tamarix tree in my garden. Rule of thumb is to prune after flowering but I didn't manage to do it during April/May this year and I am nervous about doing it as well. It is now getting too big for my small garden. Should I cut it back now or leave it until next April? I want to be quite severe with the cut back so if I do it now, I presume it will just look like a toilet brush (branches with no green) until next spring. If I leave it until after it flowers, will it grow green straight away? I am worried I might kill it and it is such a beautiful tree.