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LAWN WEEDS IN OKLAHOMA

A nice lawn is a weed free lawn, this page discusses the different types of weeds that may invade your lawn and how to control them.

Weeds are defined as a plant considered undesirable, unattractive or troublesome or one that is growing where it is not wanted.

Specific Weeds
NAMEPITCHUREDESCRIPTION
GoosegrassSummer Annual
Leaves - Grows as clump, leaves folded in bud whith base leaves being white to silver in color.
Spreads - seeds
Active - Summer
Nutsedge
Purslane
Wild Garlic wild garlic Winter Perenial
Leaves - waxy needle shaped, 8 to 12" tall.
Spreads - Bulbs and seed.
Active - April thru June.
HENBIT henbit Winter annual (member of the mint family)
Leaves - Rounded tooth edges with round ends , 4 to 12" tall.
Spreads - Seed
Active - Blooms in the spring.
White Clover
Barnyardgrass
Chickweed
Crabgrass
Curly Dock
Dallisgrass
Dandelion
Ground Ivy
Moss
Annual Bluegrass
Bull Thistle
Daisy, Oxeye
Wild Strawberry

Weed control

The chemicals used to kill weeds in turf are called herbicides.
Herbicides are catagorized - as either preemergent or postemergent. there are selective and non seletive herbiceds a non selective herbicide like roundup kills virtually everything green. A selective herbicide is one that kills specific weeds.
  • Postemergent herbicides control existing weeds ones that have allready rooted.
  • Preemergent herbicides control weeds before they germinate from seed by sterilizing the soil so the seed cant grow. So premergents are put down to stop them before they start and postemergent is put down to kill them after they are allready growing.
So weeds that have allready rooted but are dorment canot be killed with premergents because they allready exist even though the leaves or blades may look dead. Postemergent herbicides cannot stop seeds from germinating they only kill what is allready developed or green.
Weeds are categorized as - broadleaf or grassy weeds.
Grassy weeds are weeds that look like grass with blade type or needle like leaves.
Grassy weed Examples -crab grass,poa ana,goosgrass
Broadleaf weeds are weeds with wide leaves instead of needlike sort of like a tree leaf they are wide or broad.
Broadleaf weed Examples -clovers,curly dock,thistle,henbit


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