I have a long history with the Horsetail plant. It started back in my youth when I was very interested in fossils and found some amazingly big chunks of a a stem-like fossil on the side of a railroad cutout, not far from my Indiana home. After a bit of research, I discovered what I found, it was a Calamite, a tall tree-like plant (up to 100 ft, 30m tall) that lived in the Paleozoic forests 100 million years ago. I also learned that the Calamite was a relative of the Horsetail plant that still lives today. I had never heard of a Horsetail plant, but the name stuck in my mind.
When we first came to BC, and were driving through a beautiful deep forest, I kept noticing what I thought were hundreds of young conifer trees growing along the side of the road. I soon learned that what I was seeing was not small evergreen trees, but Horsetails. When we bought our land in the Robson Valley, Horsetails became a very common site.
I always loved Horsetails, and was surprised when Brian Minter, a garden expert who answers gardening questions on a on CBC radio call-in show, mentioned that Horsetails were next to impossible to get rid of, because they have roots that can go down 20 feet, and you can never get them all out. I have Horsetails in my garden and greenhouse, but I have never found them problematic.
Horsetails are very interesting plants, with the way their leaves radiate out from uniform sections along the central stem. Those stems are coated with abrasive silicates, making them useful for scouring metal items such as pans and things made of tin. Boiled and dried Horsetail stems where used in Japan for the final polishing process in wood to produce a smooth finish.
Horsetails send out an unusually shaped strange cone-like structure for dispersing their spores. A few times I have seen this spore stem, poke itself through paving on the edge of a road. I was amazed that this fragile plant could force its way through the hard surface. (photo below) I could certainly not poke my finger through it.
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