BOISE — You've probably seen them, tall purple flowers blooming near the edge of a ditch, pond or stream.

They are pretty to look at but Idaho noxious weed officials don't want you to let their appearance fool you!

They say there's a good chance those flowers are purple loosestrife, an aggressive, invasive noxious weed.

The weed can spread rapidly and completely choke out all the native plants in an infested area.

Controlling it is a challenge because it grows near water.

Officials say if you dig it up, try to get most of its roots because it will grow back if any roots are left behind.