Why Central Florida Lawns Get So Many Weeds
Central Florida’s warm, humid climate and long growing season favor a wide range of weeds, not just a handful of species. Frequent rain, sandy soils, and warm-season turfgrasses like St. Augustine, Bahia, and Zoysia all create conditions where broadleaf weeds, grassy weeds, and sedges can each find a niche somewhere in the lawn — often at the same time. Below, weeds are grouped by type to make identification a bit more manageable.
Broadleaf Weeds to Watch For
Dollarweed (Pennywort)
Dollarweed has round, glossy, lilypad-like leaves on long stems and tends to show up in overly wet or poorly drained parts of St. Augustine and Bahia lawns. Because it thrives on excess moisture, improving drainage or adjusting irrigation can help alongside any direct treatment — see our guide to grading a lawn for better drainage if standing water is a recurring issue.
Spurge
Prostrate spurge grows as a low, flat mat with small oval leaves and reddish stems that release a milky sap when broken. It tends to spread quickly in thin or stressed turf, filling in gaps where grass isn’t growing densely.
Florida Pusley
Florida pusley is recognizable by its hairy stems and small white, star-shaped flowers, and it commonly appears during the warmer summer months. It tends to favor the same thin or weak turf areas that many broadleaf weeds exploit.
Chamberbitter
Chamberbitter resembles a miniature mimosa tree, with small leaflets arranged along a central stem and tiny seed pods lined up underneath. It’s an annual that can seed prolifically, so a patch left untreated one season can return in larger numbers the next.
Broadleaf Plantain
Broadleaf plantain grows as a rosette of leaves lying flat against the ground, with a few upright flower stems rising from the center. It tends to do well in nutrient-poor soil, which means improving overall soil and lawn health can help make the lawn less hospitable to it over time.
Clover
Clover is identifiable by its three rounded leaflets (occasionally four) and is common across lawns well beyond Florida. Because clover often moves into thin, under-fertilized turf, keeping the lawn well-fed and dense is a reasonable first step toward limiting it.
Grassy Weeds That Blend In With Turf
Crabgrass
Crabgrass is a summer annual with light green, wide blades that spread outward from a central point in a finger-like pattern. It tends to thrive in dry, thin, or stressed turf, so consistent irrigation and a healthy, dense lawn can make it harder for crabgrass to get a foothold.
Torpedograss
Torpedograss is a more aggressive, invasive perennial grass with stiff, blue-green leaves and sharp, pointed underground runners (rhizomes) that make it notably difficult to remove by hand, since any leftover rhizome fragment can resprout. It’s generally considered one of the more stubborn grassy weeds to fully eliminate from Florida turf.
Goosegrass
Goosegrass forms a clumping mat with a distinctive silver-white or whitish center and tends to tolerate compacted soil better than most turfgrasses, so it’s often a sign of foot-traffic-related compaction as much as a weed problem on its own.
Sedges: Not Quite Grass, Not Quite Broadleaf
Sedges look grass-like but belong to a separate plant family, and there’s a simple way to tell them apart: sedges have a triangular stem, which you can usually feel if you roll the stem between your fingers, whereas grass stems are round or flat.
Purple and Yellow Nutsedge
Nutsedge looks similar to grass or wheat at a glance but has that characteristic triangular stem, and it often grows noticeably faster than surrounding turf after rain, which can make it stand out within a day or two of wet weather. It spreads via underground tubers (“nutlets”), which is part of why it tends to be difficult to fully eliminate.
Kyllinga
Kyllinga produces small, dense, spiky green flower balls and tends to thrive in soggy, overwatered soil, similar to dollarweed. Addressing excess moisture in the area can be a useful complement to direct treatment.
Does Your Grass Type (St. Augustine, Bahia, Zoysia) Affect Which Weeds Show Up?
To some extent, yes. Moisture-loving weeds like dollarweed and kyllinga tend to show up more in St. Augustine and Bahia lawns that are watered heavily or drain poorly, since these turf types are often grown in the lower, wetter parts of a property. Weeds like crabgrass and goosegrass are more associated with thin, compacted, or drought-stressed turf, regardless of grass species. In short, the specific weed mix is often less about the grass variety itself and more about soil moisture, soil compaction, and how dense and healthy the existing turf is.
What Kills Lawn Weeds Without Killing the Grass in Florida?
Selective herbicides are designed to target particular weed types — broadleaf weeds, grassy weeds, or sedges each generally require a different active ingredient — while leaving listed turfgrass species largely unaffected when used according to the label. Because Florida turf types vary in herbicide tolerance and some areas have seasonal fertilizer or chemical application restrictions, it’s worth checking current local guidance and product labels for your specific grass type before treating a lawn, rather than assuming one product works for every weed and every turf.
Keeping turf dense and healthy through proper mowing height, irrigation, and fertilization (within any local seasonal restrictions) also tends to make it harder for weeds to establish in the first place, since most of the weeds above take advantage of thin or stressed turf.
Which Florida Lawn Weeds Are Hardest to Control?
There isn’t a single, universally agreed-upon “worst” list, but torpedograss and nutsedge are commonly described as being among the more persistent and difficult weeds to fully eliminate, largely because both spread through underground rhizomes or tubers that can resprout from fragments left behind after pulling or shallow treatment. Yarrow-type perennial weeds elsewhere can be similarly tolerant of common herbicides, though that specific weed is more associated with cooler-climate lawns than Central Florida turf — see our New Zealand lawn weeds guide for an example of how the common weed list shifts by region and climate.
How to Identify a Weed You’re Not Sure About
If you’re unsure which weed you’re dealing with, a few identifying features are usually enough to narrow it down: leaf shape (round vs. narrow vs. divided), whether the stem is round, flat, or triangular, where in the lawn it’s growing (wet low spots vs. dry sunny areas), and the time of year it appeared. University extension resources, such as state agricultural institutes’ weed identification pages, tend to be a reliable free resource for confirming an identification, since they’re focused specifically on regional turf and landscape weeds rather than general gardening content.
FAQ
What kills lawn weeds but not grass? Selective herbicides matched to the specific weed type (broadleaf, grassy, or sedge) and to your turfgrass species are generally the safest approach, since the right product is formulated to leave listed grass types largely unaffected. Always check the current label for compatibility with your turf.
What are the worst weeds to control in Florida? There’s no single agreed-upon ranking, but torpedograss and nutsedge are frequently mentioned as particularly persistent because they spread through underground rhizomes or tubers that can regrow from fragments left in the soil.
How do I get rid of weeds in my lawn in Florida? Identifying the weed type first (broadleaf, grassy, or sedge) matters because each generally needs a different herbicide approach. Alongside any treatment, improving drainage, irrigation habits, and overall turf density tends to reduce how much room weeds have to establish.
How can I identify different types of weeds in my lawn? Look at leaf shape, stem shape (round, flat, or triangular for sedges), and where in the lawn the weed is growing — wet, shaded, or sunny, dry areas each tend to favor different weeds. University extension or agricultural institute weed ID resources are a reliable way to confirm a guess.