Horsetails are an unusual group of plants that reproduce via spores instead of seeds. Now limited to a single genus, Horsetails were once the dominant plant of the prehistoric world, first appearing in the Devonian period approximately 375 million years ago. Today’s Horsetails, oddly enough, are poisonous to horses. There's a variety on the allotment very hard to eradicate! Weird Plants, Unusual Plants, Exotic Plants, Botanical Flowers, Botanical Art, Horse Tail Plant, Living Fossil