Common Name: johnsongrass
Species: Sorghum halepense (L.) Pers.
Bayer Code: SORHA

Johnsongrass is not a common weed in turf situations. It is frequently found on roadsides, but is also found in pastures and disturbed fields. It does not grow well in frequent, close mowing situations. As an adult plant, johnsongrass is characterized by its dense growth habit, with stems that can reach 6 ft in height. The leaf blades are rough, and the prominent white raised midveins that run the length of the leaf are distinctive. The seedhead is purple.
mature johnsongrass
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johnsongrass seedhead
johnsongrass vernation
johnsongrass
johnsongrass vernation
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CharacteristicTypeDescription
Seedhead / Flower panicleseedhead is often purplish
Vernation Type rolled 
Ligule Type membranousfine hairs
Growth Season / Life Cycle perennial weed 
Auricle Type absent 
Leaf Blade Tip Shape sharp-pointed 
Leaf Blade Width broad, greater than 0.2 in0.4 - 1.2 inches (10 to 30 mm) wide
Stolon Presence absent 
Rhizome Presence present 
Collar Type continuous 
Sheath Margin open 
Sheath Type flattened OR roundround to somewhat flattened