Weeds - Zoysia Lawn - Annual Pigweed
BES-TEX Weed ID Guide · Broadleaf Weeds
Annual Pigweed
Also called Redroot Pigweed · Amaranthus retroflexus
Summer Annual Broadleaf
Common Name
Annual Pigweed, Redroot Pigweed
Latin Name
Amaranthus retroflexus
Family
Amaranthaceae
Life Cycle / Type
Summer annual · Broadleaf
What Is It?
Annual pigweed is a fast-growing summer annual broadleaf weed. It thrives in disturbed soil, thin turf, and high-fertility areas.
How to spot it
Leaves: smooth to slightly hairy
Root: thick, reddish taproot
Growth habit: upright
Soil Temperature & Germination
Annual pigweed germinates when soil temperatures rise above 55°F, with heavier pressure as temperatures increase.
55°F
75°F
Above 55°F
Germination begins
Above 75°F
Peak germination and rapid growth
Decision Question
Is the weed visible above the soil right now?
Why This Weed Comes Back
Missed spring pre-emergent timing
Soil disturbance or bare areas
Thin or stressed turf
Learn the Basics
A healthy, thick lawn is the best defense against weeds.
