If you've ever battled horsetail weeds in your yard, you know just how stubborn these plants can be. Horsetail (genus Equisetum) has been around since prehistoric times, and it sure acts like it!

Goldbugs have a new prospecting tool: the horsetail weed (Equisetum arvense) which grows abundantly across the U. S. and Canada. When it grows in soil with a gold content, it hungrily absorbs the ...