Flat worms are native to Indo-China, but they travel around the world by hitching a ride in greenhouse plants. For the most part, flat worms can survive just about anywhere, so no one region is 100 percent safe.

A flat worm, also spelled “flatworm,” is native to Indo-China, but it makes its way around the world by traveling in greenhouse plants. For the most part, flat worms can survive just about anywhere, so no one region is 100% safe.

The flat worm is usually medium-brown in color with dark markings or stripes. Some worms may appear gray to greenish/gray as well. All types feed on earthworms, so beware.