Type: Broadleaf perennial

Size: To 4 feet tall and 2 feet wide

Where It Grows: Landscape and garden areas in sun or shade

Appearance: Dock produces large, wavy-edge leaves and large seed heads covered with brown seeds.

Control: Mulch to prevent dock. Pull and dig up plants or treat with a postemergence herbicide.

Test Garden Tip: Each plant can produce up to 40,000 seeds that wait decades before sprouting.