Lawn Weed Control for Southwest Florida Lawns
Weed Control That Does Not Kill the Lawn With It
Most weed problems in this part of Florida are not really weed problems. They are lawn problems that weeds moved into.
Healthy St. Augustine is dense enough to crowd out almost everything. When weeds take over a lawn here, something opened the door first: the turf thinned from chinch bugs, an area stays too wet, the soil compacted, the lawn went unfed through the summer fertilizer ban, or it got scalped by mowing too short. Spraying the weeds without fixing that gets you a clean lawn for a few weeks and the same weeds back by the next season.
The other half of the problem is that St. Augustine is sensitive. A lot of the products that kill Florida weeds efficiently will also damage or kill St. Augustine, and some of them do it at temperatures we hit for half the year. Product choice and timing here are not a detail, they are the whole job.
Westfall's has treated lawns in Manatee and Sarasota counties since 2001. Our technicians are state-certified and hold the FDACS certification required to apply commercially in these counties. Call (941) 231-7285 for a free lawn evaluation.
The Weeds That Take Over Lawns Here
Six account for most of what we treat. Several of them are telling you something about the lawn beyond the weed itself.
Dollarweed
Round, glossy, coin-sized leaves with the stem attached at the middle of the leaf rather than the edge. It spreads by underground runners, so pulling it usually leaves most of the plant behind.
Dollarweed is a moisture indicator. If you have it, the area is staying wetter than the turf wants, and the cause is usually overwatering, a low spot that does not drain, or an irrigation head throwing more water on one zone than another. Treating it without fixing the water means treating it again.
The fix is both: post-emergent treatment for what is there, and a look at the irrigation and drainage so it does not come straight back.
Sedge and Nutsedge
The bright yellow-green one that seems to grow twice as fast as everything around it, so the lawn looks uneven a day after mowing. Sedge stems are triangular. Roll one between your fingers and you can feel the three edges, which is the quickest way to tell it from a grass.
Sedge is not a grass and it does not respond to normal broadleaf weed products. It needs a specific sedge treatment, which is one of the more common reasons a homeowner tells us they have sprayed repeatedly with no effect.
It also reproduces from underground tubers, so a single treatment rarely finishes it. Expect a program rather than a one-off. Like dollarweed, heavy sedge usually means the area is staying too wet.
Crabgrass
Coarse, pale green, growing in a low spreading star from a central point, thriving in exactly the spots where the lawn is thin and the sun is hardest. Driveway edges, sidewalk strips and any area that has been scalped by mowing.
Crabgrass is an annual. It comes back from seed every year rather than surviving in the lawn, which is what makes pre-emergent so effective on it. A pre-emergent applied before the soil warms enough for germination stops the seed before it starts, and that is far easier than fighting mature crabgrass in a St. Augustine lawn, where the products that kill it are limited and the margin for error is small.
If you are fighting crabgrass every summer, the answer is almost always to move the timing earlier, not to spray harder.
Florida Betony
Also called rattlesnake weed. Square stems, opposite leaves, small white to pink flowers, and a distinctive white segmented tuber underground that looks like a rattlesnake rattle, which is where the name comes from.
Betony is a cool-season weed here. It shows up as the temperatures drop and the St. Augustine slows down, which is why it seems to appear from nowhere in late fall and winter. The tubers are the reason it is persistent: kill the top growth and the tuber sends up another plant.
It needs repeated treatment across a season, and fall is when to start rather than when you notice it in January.
Spurge and Doveweed
Spurge grows flat and spreading, with small paired leaves and a milky sap if you break the stem. It loves heat and bare soil, so it moves into thin areas fast in summer.
Doveweed is the one that fools people. It looks enough like young St. Augustine to go unnoticed until it has taken over a section, with thick fleshy stems and narrow blade-like leaves. It germinates late in the season, well after most pre-emergent applications have worn off, which is exactly why it gets established.
Both are strong signals that the lawn is thin. Neither establishes in dense healthy turf.
Why Timing Decides the Whole Year
There are two kinds of weed treatment and the difference matters more than the products do.
Pre-emergent goes down before the weed seed germinates and stops it from establishing. It does nothing to a weed that is already up. Its entire value depends on going down at the right moment, which is set by soil temperature rather than by the calendar, and the window is a matter of weeks.
Post-emergent treats what is already growing. It works, but it is always the more expensive and less complete option, because by then the weed has already taken space the grass wanted and left a gap when it dies.
In this part of Florida there are two pre-emergent windows that matter. One in late winter and early spring ahead of the summer weeds, and one in fall ahead of the cool-season weeds like betony and annual bluegrass. Miss the fall window and you spend the winter treating weeds that a single well-timed application would have prevented.
That is the practical case for a program over calling someone when the lawn looks bad. By the time it looks bad, the cheap option has passed.
Our Process Keeps Your Property Healthy And Beautiful
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FertilizationWhen you need lawn fertilizing services in West Florida or the surrounding areas, you can rely on the experienced and professional team at Westfall's Lawn and Pest. -
Shrub & OrnamentalWestfall's Lawn Care and Pest Control offers comprehensive shrub and tree services to make sure that you never have to worry about your outdoor spaces again.
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Tree InjectionsOur tree injection services are a fast, effective way to protect your trees while preserving their natural beauty. We offer a comprehensive process that includes a pest inspection and treatment plan.
How We Treat Weeds Without Damaging St. Augustine
Every visit starts with identifying what is actually growing. Sedge, broadleaf weeds and grassy weeds need three different products, and the most common reason a homeowner has sprayed repeatedly with no result is that the product never matched the weed.
Product selection is then narrowed by the grass. St. Augustine will not tolerate several of the herbicides that work well on other turf types, and some of what it does tolerate becomes damaging above certain temperatures, which in this climate rules out a lot of the summer. We select for the grass first and the weed second, because a dead weed in a damaged lawn is not a result.
We apply pre-emergent at the two windows that matter, watching soil temperature rather than the calendar, and treat post-emergent as needed in between.
Then we deal with the reason the weeds got in. If dollarweed and sedge keep coming back, the answer is in the irrigation, not in the sprayer. If crabgrass owns the driveway edge every summer, the mowing height is usually part of it. We will tell you what we are seeing even when the fix is something you do rather than something we sell.
Weed Control Questions, Answered
Why do the weeds keep coming back?
Usually because the lawn is thin and something is keeping it thin. Weeds are opportunists and they do not establish in dense healthy turf. If they return every year in the same spot, look at what is different about that spot: too much shade, too much water, compacted soil, or damage from an insect. Treating the weed without changing that gets the same result next season.
I sprayed and nothing happened. Why?
Most often the product did not match the weed. Sedge in particular ignores standard broadleaf products, and it is one of the most common weeds here. Grassy weeds like crabgrass and doveweed need something different again. It can also be timing, since some weeds are far harder to kill once mature.
Will weed control hurt my St. Augustine?
It can, which is exactly why product choice matters. Several herbicides that handle Florida weeds efficiently will damage or kill St. Augustine, and some become risky above certain temperatures. We select products the grass tolerates and apply them when it is safe to do so.
What is the difference between pre-emergent and post-emergent?
Pre-emergent stops weed seed from establishing and has to go down before germination. Post-emergent kills weeds that are already growing. Pre-emergent is cheaper, more complete and less disruptive, but only if the timing is right, which is the main thing a program buys you.
When should weed control start?
Fall is one of the two most valuable windows in this climate, because a pre-emergent application then prevents the cool-season weeds that otherwise take hold through winter. The other is late winter into spring, ahead of the summer weeds.
Do you handle weeds in beds and around shrubs as well?
Yes, that falls under shrub and ornamental care. Beds need different products from turf, so tell us if you want both covered and we will scope it in.
Is it safe around pets and kids?
Yes. We use environmentally responsible products applied to targeted areas, and if anything needs drying time before people or animals are back on the lawn, the technician tells you before they leave.
Get a Free Lawn Evaluation
If weeds are taking over, we will come out and identify what you actually have, tell you why it got in, and give you a plan and a price. The evaluation costs nothing and there is no obligation.
Call (941) 231-7285 or request a free lawn evaluation online.
