Johnsongrass
Sorghum halepense · Warm-season perennial, C4
AI-generated identification · may be incorrect
Grass Category
Invasive/Weed
Hardiness Zones
USDA zones 6 through 9, highly sensitive to heavy frost but winter-hardy via rhizomes in warmer regions.
About This Grass
Tall coarse grass growing up to 7 feet with bright green leaves and a large, open, purplish panicle seed head.
Blade Characteristics
Wide flat blades up to 1 inch across with a prominent white midrib and pointed tips.
Growing Information
Growth Habit
Aggressively rhizomatous and stoloniferous, forming dense clumps and extensive underground networks.
Sunlight & Water Needs
Requires full sun and adapts well to various soils, showing good drought tolerance once established.
Mowing & Maintenance
High maintenance weed requiring frequent mowing or systemic herbicides for control due to aggressive spreading.
Identified on 10/3/2026