Hi, exploziv. I have seen a few Equisetum ramosissimum
here about 2m tall. But they cannot withstand upright by themselves.
I think they are poisonous. Unlike the giant ones which aren't poisonous and they can be used as medicine or against mold in plants.
I forget to say that the species in the pics above is Equisetum giganteum
. There are another giant horsetail species Equisetum myriochaetum
, taller but thinner. And also a sterile hybrid among them E. x schaffneri