Over a third of U.S. plants and animals are at risk of extinction according to a report by the conservation group NatureServe. 12 Common Perennials You Should Plant in August for More Blooms Through Fall Plant This for purple power: Spiderwort Digging Phlox Flower Growing Guides, Tips, and Information Gardener's Path Wax Gourd Benincasa Hispida , or Ash Pumpkin, Winter Melon Stock Vector Illustration of remedy, hispida: 146084395