Pink mimosa (Albizia julibrissin) trees, also known as silk trees, are beautiful, drought-resistant, and delightful to observe. The leaves fold when touched at night or when exposed to extreme cold or ...

Call them plant motors. Or plant muscles. Tiny bulges of specialized cells in a mimosa plant can fold its feathery leaflets together in seconds, then relax — and do it again. A new look at these ...