Johnsongrass

Sorghum halepense · Warm-season, perennial, C4

AI-generated identification · may be incorrect
Johnsongrass

Grass Category

Invasive/Weed

Hardiness Zones

USDA zones 6 through 9, highly cold-hardy for a warm-season grass due to underground rhizomes.

About This Grass

Tall, coarse grass reaching 3 to 7 feet with prominent central veins and large, open, purplish seed heads.

Blade Characteristics

Wide flat blades with a prominent white midrib, pointed tips, and a membranous ligule.

Growing Information

Growth Habit

Aggressive rhizomatous and bunch-type, spreading rapidly to form dense colonies.

Sunlight & Water Needs

Requires full sun and moderate moisture, highly drought tolerant once established, adapts to most soils.

Mowing & Maintenance

High maintenance weed requiring frequent mowing or herbicide control due to aggressive spreading.

Identified on 10/3/2026