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St. Augustinegrass

Description

St. Augustinegrass is a warm-season grass with medium density and medium to dark green color. Of all the warm season grasses, it is the least cold tolerant and has the coarsest leaf texture. St. Augustinegrass grows best in warm, humid areas that are not exposed to long periods of cold weather. In fact, its lack of cold tolerance is the major limiting factor in determining its use in North Carolina. Centipedegrass can often be confused with St. Augustinegrass. However, centipedegrass has alternating leaves at the nodes whereas St. Augustinegrass has opposite leaves at the nodes. Centipedegrass also has a more pointed, slenderer leaf blade than St. Augustinegrass. Both leaf blades are V-shaped in cross section, but that of St. Augustinegrass has a more obviously boat-shaped tip.

lawn Maintenance for June - August

Disease Control

Check for Gray Leaf Spot and Brown (Large) Patch.

Fertilization

Apply ½ pound of nitrogen per 1,000 square feet in June and August and 1 pound of nitrogen in July. In the absence of a soil test, use a complete (N-P-K) fertilizer with a 3-1-2 or 4-1-2 ratio.

Insect Control

If drought symptoms or yellow spots occur in a sunny location, check for chinch bug activity. Push a coffee can (with both top and bottom removed) into the ground and fill it with water. Any chinch bugs present will float. Treat for chinch bugs if you have 20 or more chinch bugs per 1,000 square feet.

Irrigation

Same as March through May guidelines.

Mowing

Same as March through May guidelines.

Thatch Removal

If thatch was ¾ inches thick last summer, mow grass to 2 ½ inches and use a power rake with 3-inch blade spacing.

Weed Control

Apply postemergence herbicides to control summer annual and perennial broadleaf weeds, such as knotweed, spurge, and lespedeza. Since St. Augustinegrass is sensitive to certain herbicides (2,4-D and MSMA), follow label directions and use with caution. Do not apply herbicides unless weeds are actively growing and the lawn is not under drought stress. If crabgrass and goosegrass are present, make a note to apply a preemergence herbicide next spring.

Presentations

Publications

Species Data

Seedhead/Flower

seedhead a thick spike with spikelets imbedded along the sides

p1130800 staugustinegrass
p1130800 staugustinegrass
p1130800 staugustinegrass
seedhead
seedhead
seedhead
seedhead3
seedhead3
seedhead3
seedhead4
seedhead4
seedhead4
Vernation type

leaves folded in the bud

node2
node2
node2
sheath2
sheath2
sheath2
Ligule Type

short fringe of hairs, 0.01 inches (0.3 mm) long

ligule
ligule
ligule
ligulearea2
ligulearea2
ligulearea2
Growth Season/Life Cycle

warm season turf

Auricle type

absent

ligulearea2
ligulearea2
ligulearea2
Leaf blade tip shape

boat shaped; blunt; not hairy

staugustine centipede
staugustine centipede
staugustine centipede
autopsy
autopsy
autopsy
grass
grass
grass
grass4
grass4
grass4
leafarrangement
leafarrangement
leafarrangement
leafblade
leafblade
leafblade
leafbladetip
leafbladetip
leafbladetip
staugustinegrass p1190867
staugustinegrass p1190867
staugustinegrass p1190867
staugustine centipede
staugustine centipede
staugustine centipede
Leaf blade width

0.16 - 0.4 inches (4 - 10 mm) wide

staugustine centipede
staugustine centipede
staugustine centipede
leafarrangement
leafarrangement
leafarrangement
leafblade
leafblade
leafblade
leafbladetip
leafbladetip
leafbladetip
seedhead3
seedhead3
seedhead3
staugustine centipede
staugustine centipede
staugustine centipede
Stolon Presence

present; stout

seedhead4
seedhead4
seedhead4
stolon
stolon
stolon
Rhizome Presence

absent

Collar Type

continuous; not hairy, constricted

collar3
collar3
collar3
ligulearea2
ligulearea2
ligulearea2
sheath2
sheath2
sheath2
Sheath Margin

open; sheath is slightly hairy along edges and toward top

sheath2
sheath2
sheath2