Carolina Geranium

Carolina geranium is a broadleaf winter annual (and sometimes biennial) weed commonly found in lawns, ornamental beds, and along roadsides. It emerges during the cool months and becomes especially noticeable in spring with its small pink flowers and deeply lobed leaves. While somewhat attractive at a glance, it competes aggressively with turfgrass, especially in thin or nutrient-poor areas.

How to Identify

Carolina geranium has palmately divided leaves with 5–7 lobes that resemble small maple leaves. The leaves are slightly hairy and attached to long stems that radiate from a central crown. As the plant matures, it forms multiple branching stems that sprawl outward, giving it a somewhat weedy, sprawling appearance. In spring, it produces small, five-petaled pink to lavender flowers, followed by distinctive “crane’s-bill” seedpods—long, pointed capsules that give the genus its common name “crane’s-bill geranium.”

Lifecycle

Carolina geranium typically germinates in the fall when soil temperatures drop below about 70°F (21°C). It overwinters as a low rosette, then bolts and flowers in spring before dying off with summer heat. In shaded or cool locations, it may persist longer or behave like a short-lived perennial.

Prevention & Control

Carolina geranium can be controlled through preventative and corrective approaches: Pre-emergent herbicides: Apply a pre-emergent product in late summer to early fall before germination occurs. Post-emergent herbicides: Use a selective broadleaf herbicide containing active ingredients such as 2,4-D, dicamba, or MCPP/MCPA to control young plants. Cultural practices: Promote dense, healthy turf through regular fertilization, proper mowing height, and soil aeration. Thin, compacted, or nutrient-poor areas are much more likely to be invaded.