Which horsetail are you talking about?
Equisetum hyemale is a very tall reed type.
Equisetum arvense is the type I see growing all over, but it's not very tall.
There is also a plant that Dan Hinkley sells which I want to like (it's a very good looking plant), but it just looks too much like the weedy one (arvense) for me to plant it in my yard
