what will you do with this?
I believe it can also be put in a hot bath to ease skin complaints. I'd have to check my notes to be sure.
Looks like I have a namesake
Equisetum telmateia Great Horsetail, Northern Giant
Kev
Get rid of it if its in your garden or paved area as its one of the most destructive weeds there is. Splits concreate and very hard to dig up or kill off.
The sterile, Summer stems make a good tea. It's full of minerals, good for stengthening nails and hair, wounds, anaemia.......
http://www.purplesage.org.uk/profiles/horsetail.htm
Caution: Correct identification of this plant is important since other species of Equisetum contain toxic alkaloids, and excessive doses of E. arvense can themselves lead to symptoms of poisoning. It should not be used where there is cardiac or renal dysfunction (a warning sign is albuminuria).
Large quantities of the plant can be toxic. This is because it contains the enzyme thiaminase[172], a substance that can rob the body of the vitamin B complex[65]. In small quantities this enzyme will do no harm to people eating an adequate diet that is rich in vitamin B, though large quantities can cause severe health problems. The enzyme is destroyed by heat or thorough drying, so cooking the plant will remove the thiaminase
Hmmmm - one of its names is "Bottle Brush" so that might give you a clue...
As Forestwalker said, use it to clean pots. It's Mare's tail