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Carolina Geranium

Description

Carolina geranium is a winter annual or biennial weed that is also called cranesbill because the fruits have a conspicuous "beak" about ½ inch long. The leaves are deeply five- to seven-lobed and each lobe is again lobed and bluntly toothed. The flower is white to lavender and borne two to several together on stalks from the upper nodes. It blooms mostly in April and May.

Cultural Control

Proper turf management is important for biennial broadleaf weed control. Maintain a dense, actively growing turf through proper mowing, fertilizing, and watering practices. Mow at the proper height for your selected adapted turfgrass. Coring and traffic control reduce compaction and encourage desirable turfgrass competition. It is best to control this biennial broadleaf weed in spring or fall, if actively growing at these times.

Chemical Control

Herbicide and Formulation
Amount of Formulation per 1,000 sq ft
Amount of Formulation per Acre
Pounds Active Ingredient per Acre

Preemergence and Postemergence Control

Herbicide and Formulation

mesotrione, MOA 27 (Tenacity) 4 SC

Amount of Formulation per 1,000 sq ft

0.092 to 0.183 fl oz

Amount of Formulation per Acre

4 to 8 fl oz

Pounds Active Ingredient per Acre

0.125 to 0.25

Precaution and Remarks

Use on residential turf, golf courses (not greens) and sod farms for pre- and postemergence weed control. Tolerant turfgrasses include St. Augustinegrass, centipedegrass, tall fescue, fine fescue, Kentucky bluegrass, and perennial ryegrass. Add a nonionic surfactant and repeat application after 2 to 3 weeks for improved postemergence control. Tank mix with Barricade 65 WG for extended preemergence grassy weed control. Can be applied at seeding to all tolerant grasses except fine fescue. After turf germination, wait 4 weeks or until turf has been mowed twice before making a postemergence application. Also controls henbit, chickweed, dandelion, white clover, Florida betony, Florida pusley, ground ivy, oxalis, wild violet, creeping bentgrass, and yellow nutsedge.

Preemergence and Postemergence Control

Herbicide and Formulation

sulfentrazone + prodiamine, MOA 14 + 3 (Echelon 4 SC) 4 SC

Amount of Formulation per 1,000 sq ft

0.184 to 0.826 fl oz

Amount of Formulation per Acre

0.5 to 2.25 pt

Pounds Active Ingredient per Acre

0.25 to 1.125

Precaution and Remarks

For use in residential and institutional lawns, athletic fields, sod farms, golf course fairways and roughs, roadsides, utility right-of-ways, railways, and industrial areas. Apply to turf following a second mowing if a good root system has been established. Apply up to 12 fluid ounces per acre to bentgrass at 0.5 inches or higher, fine fescue, and perennial ryegrass. Apply 18 to 24 fluid ounces per acre to perennial bluegrass, tall fescue, and all warm season grasses except St. Augustinegrass (do not apply) and bermudagrass (apply 18 to 36 fluid ounces per acre). For sod production, apply 6 months after establishment, and do not harvest within 3 months. Do not apply with adjuvants or surfactants. Echelon should not be applied to cool-season turf with N-containing fertilizers unless some short-term discoloration is tolerable.

Presentations

Publications

Species Data

Growth Season/Life Cycle

winter annual or biennial weed

Growth Habit

upright; basal rosette of leaves, stems erect

autopsy
autopsy
autopsy
autopsy2
autopsy2
autopsy2
p1020590
p1020590
p1020590
p1020744
p1020744
p1020744
Leaflet Number

one

Leaf Margin

deeply five- to seven-lobed and each lobe is again lobed and bluntly toothed

carolinageranium
carolinageranium
carolinageranium
leafback
leafback
leafback
venation
venation
venation
weed6
weed6
weed6
Leaf Hairs

none

Leaf/Leaflet Shape

heart/kidney/spade

carolinageranium
carolinageranium
carolinageranium
leafback
leafback
leafback
p1050870
p1050870
p1050870
p1050871
p1050871
p1050871
venation
venation
venation
weed3
weed3
weed3
weed6
weed6
weed6
Leaf Width

1 inch to greater than 2 inches

carolinageranium
carolinageranium
carolinageranium
leafback
leafback
leafback
venation
venation
venation
Leaf Venation

palmate

carolinageranium
carolinageranium
carolinageranium
leafback
leafback
leafback
venation
venation
venation
weed6
weed6
weed6
Leaf Arrangement

usually alternate near base, opposite above

autopsy
autopsy
autopsy
autopsy2
autopsy2
autopsy2
carolinageranium
carolinageranium
carolinageranium
p1020423
p1020423
p1020423
p1020590
p1020590
p1020590
root
root
root
Root Type

taproot

root
root
root
Flower Color

blue/purple or white

p1040191
p1040191
p1040191
p1050838
p1050838
p1050838
p1050870
p1050870
p1050870
p1050871
p1050871
p1050871