Type: Broadleaf perennial

Size: To 6 feet tall and 3 feet wide

Where It Grows: Garden areas with rich, moist soil

Appearance: This garden weed has sawtooth-edge leaves and yellowish flower clusters covered with stinging hairs.

Control: Mulch to prevent nettle. Dig out weeds or treat with a postemergence herbicide.

Test Garden Tip: Always wear gloves when working around this plant (the sharp hairs can irritate skin).