NC State Extension Publications

Description

Carolina geranium is a winter annual or biennial weed that is also called cranesbill because the fruits have a conspicuous "beak" about 12 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
mesotrione, MOA 27 (4 SC) (Tenacity) 0.092 to 0.183 fl oz 4 to 8 fl oz 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 prodiamine 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.​
[sulfentrazone + prodiamine], MOA 14 + 3 (4 SC) (Echelon) 0.184 to 0.826 fl oz 0.5 to 2.25 pt 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 inch 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. [Sulfentrazone + prodiamine should not be applied to cool-season turf with N-containing fertilizers unless some short-term discoloration is tolerable.​

Species Data

Carolina geranium growth habit.

Figure 1. Carolina geranium growth habit.

Carolina geranium growth habit.

Figure 2. Carolina geranium growth habit.

Carolina geranium growth habit.

Figure 3. Carolina geranium growth habit.

Carolina geranium growth habit.

Figure 4. Carolina geranium growth habit.

Carolina geranium leaf margin.

Figure 5. Carolina geranium leaf margin.

Carolina geranium leaf margin.

Figure 6. Carolina geranium leaf margin.

Carolina geranium leaf margin.

Figure 7. Carolina geranium leaf margin.

Carolina geranium leaf margin.

Figure 8. Carolina geranium leaf margin.

Carolina geranium flower color.

Figure 9. Carolina geranium flower color.

Carolina geranium flower color.

Figure 10. Carolina geranium flower color.

Carolina geranium leaf arrangement.

Figure 11. Carolina geranium leaf arrangement.

Carolina geranium leaf arrangement.

Figure 12. Carolina geranium leaf arrangement.

Carolina geranium leaf arrangement.

Figure 13. Carolina geranium leaf arrangement.

Carolina geranium root type.

Figure 14. Carolina geranium root type.

Carolina geranium flower color.

Figure 15. Carolina geranium flower color.

Carolina geranium flower color.

Figure 16. Carolina geranium flower color.

Author:

Professor and Extension Turfgrass Specialist
Crop and Soil Sciences

Publication date: Nov. 21, 2017

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