I'm having trouble with my horsetail reed. I have a couple large and narrow planters I'm trying to grow a thick and straight wall of the reed in. The reeds are growing well, but need pruning often as they grow too high and then start growing sideways or falling down. But, when I prune the reeds the particular reed I trim starts a new growth off the side of the tip I trimmed. So now I'm getting a bunch of skinny little reeds growing haphazardly off the shoots, looking anything but straight and uniform. As you can see in the pix, those are both reeds that I pruned. The original stalk stopped growing where I cut it and the skinnier reeds are now growing off of it. Is there a certain way to cut the reeds where they don't start growing tiny offshoots?
