Type: Broadleaf annual
Size: 6 feet tall, 2 feet wide
Where it grows: Sunny landscape or garden areas
Appearance: Pigweeds are tall plants with a taproot. Identify weeds by their hairy-looking clusters of green flowers (though some varieties are grown as annuals).
Control: Mulch garden areas in spring to prevent pigweed or use a preemergence herbicide in spring. Pull weeds by hand or spray with a postemergence herbicide.