Milkweed is the one and only host plant for monarch caterpillars and butterflies, which prefer local, native varieties. Avoid growing non-native tropical milkweed. When you’re done reading these ...

RIO GRANDE CITY, Texas— The U.S. Fish and Wildlife Service today protected the prostrate milkweed as endangered. Only 24 populations of the plant survive, in south Texas and northern Mexico, where ...

Monarch butterflies require milkweed plants as egg-laying sites, but they also migrate long distances every spring and fall, and the route from Mexico to Canada passes through the San Antonio area.