Ronstar FLO
Product Overview
Key Benefits
Works on warm-season grasses
- One pre-emergent application – even in cold weather, or weeks before seed germination – controls weeds all season long
- Offers an environment conducive to sprigging
- Doesn’t inhibit turf root growth or recovery from damage
- Doesn’t prevent roots from tacking dow
Use & Control
Bittergrass, bristly oxtongue, carpetweed, cheeseweed, common groundsel, common purslane, evening primrose ragwort, lambsquarters, liverwort, oxalis, Pennsylvania smartweed, prostrate spurge, redroot pigweed, sow thistle, speedwell, spotted catsear, swinecress, yellow woodsorrel
Grassy weeds:
Annual bluegrass, barnyardgrass, carpetgrass, crabgrass, fall panicum, goose grass, green foxtail, wild oats
Please see the product label for a full list of pests
Related Resources
White Papers
Label
SDS
Use & Safety
Map
State Approvals
Ronstar FLO has been federally approved and registered in all continental US states. Contact your Envu representative to learn more.

This map was most recently updated June 2, 2025
Similar Products
Prograss EC
Prograss EC provides both pre- and post-emergent control of Poa annua in cool-season turf grasses and overseeded bermudagrass. This means Poa can be controlled through its cool-season germination and growth periods. A customized Prograss program can...
See product
Acclaim Extra
Effective herbicide control when you need it most. Acclaim® Extra Herbicide offers reliable postemergence control of crabgrass and goosegrass without harming cool-season turf. Rainfast in one hour, Acclaim Extra is most effective when weeds are...
See product
Revolver
Works quickly – even faster in warmer temperatures. Revolver® herbicide controls many tough-to-control grassy weeds such as Poa annua, goosegrass, clumpy ryegrass and tall fescue. It’s readily absorbed by foliage, where it stops production of key...
See product
Tribute Total
The complete solution for controlling grassy weeds, broadleaf weeds and sedges. Tribute® Total provides broad-spectrum, postemergence weed control in Bermudagrass and zoysiagrass. It’s the complete solution for the most troublesome weeds.
See product
Proxy
Proxy helps control growth of desirable cool-season grasses and suppresses seedheads of Poa annua and white clover. This product does not cause initial turf shock, phytotoxicity or post-application growth surge. Helps reduce labor and creates turf...
See product
Sencor 75
Long-lasting, broad-spectrum weed control. Sencor® 75 offers highly effective control of tough weeds in dormant and actively growing bermudagrass turf.
See product
Acclaim Accelerate
Acclaim® Accelerate targets crabgrass with a formulation that improves absorption into the plant and controls the full range of crabgrass, including the tougher to control intermediate size (3 to 5 tiller) unlike other formulations of quinclorac. It...
See product
Celsius WG
Weeds will wish they never sprouted. Celsius® is a postemergence, warm-season turf herbicide that handles conditions many other products cannot. It has one of the broadest spectrums of control on the market and controls more than 120 weeds,...
See product
Specticle FLO
When weeds don't grow, your business can. When it comes to keeping turf looking beautiful, you can count on Specticle® FLO. It’s been proven to provide superior preemergence control of the most troublesome weeds. It also offers postemergence control...
See product
Specticle G
Specticle G is a versatile, premergence herbicide that sets a new standard for residual control at the lowest use rates on the market. It helps maintain premium, weed-free landscape beds for the entire growing season – making it one of the most...
See product
Signature Xtra Stressgard
Enhanced Stressgard Formulation Technology for proven plant health effects. Signature™ XTRA Stressgard® is a true systemic fungicide that enhances plant health and turf quality, even under the most severe environmental conditions. It’s often used as...
See product
Echelon 4SC
This patented formulation is both root and shoot absorbed, Echelon® 4SC herbicide controls weeds from the foliage down and from the root up. In independent tests and case studies, Echelon 4SC herbicide has demonstrated proven efficacy and...
See product
Xonerate 2SC
Xonerate® 2SC Herbicide delivers effective postemergence control of tough weeds on warm- and cool-season turfgrass. This new and improved formulation of Xonerate Herbicide provides excellent control of tropical signalgrass, poa annua and other...
See product