Grassy Weeds - St Augustine Lawn - King Ranch Bluestem
BES-TEX Weed ID Guide · Grassy Weeds
King Ranch Bluestem
Bothriochloa ischaemum var. songarica
Common Name
King Ranch Bluestem
Latin Name
Bothriochloa ischaemum var. songarica
Family
Poaceae
Life Cycle / Type
Perennial · Grassy weed
What Is It?
King Ranch bluestem is a coarse, aggressive perennial grass with upright clumps, bluish-green leaves, and tall seedheads. It spreads by seed and a persistent crown and quickly displaces desirable turf and native grasses. It is commonly found in pastures, roadsides, fence rows, and unmanaged areas, and can invade thin lawns. This is a perennial weed. Pre-emergent herbicides do not control existing perennial weeds.
Soil Temperature & Germination
King Ranch bluestem establishes and grows as soils warm.
Above 65°F
Active growth begins
Above 75°F
Rapid growth and seed production
Decision Question
Is the King Ranch bluestem visible above the soil right now?
NO
It has not emerged.
Pre-emergent may reduce new seedlings but will not control established plants.
Pre-Emergent Herbicide BMPWhy This Weed Comes Back
Perennial growth with persistent crowns
Heavy seed production
Thin or unmanaged turf
Learn the Basics
A healthy, thick lawn is the best defense against weeds.
