If you’re dealing with tough brush and weeds in your lawn, you might be wondering, will Crossbow kill grass? Crossbow is a potent herbicide, and its application near desirable turf requires precise understanding and caution. The answer is not a simple yes or no, as it depends entirely on the type of grass and how you apply it. This guide will walk you through everything you need to know to use Crossbow effectively without harming your lawn.
Using herbicides incorrectly can lead to costly damage. Crossbow is formulated to target specific plants, but it can affect grasses under certain conditions. Knowing the difference between your lawn grass and the weeds you want to eliminate is the first step to success. Let’s break down how Crossbow works and how you can use it safely.
Will Crossbow Kill Grass
Crossbow herbicide is primarily designed to control broadleaf weeds and woody plants, not grasses. Its active ingredients, 2,4-D and triclopyr, target plants with broad leaves by mimicking plant growth hormones. This causes uncontrolled growth that eventually kills the weed. Most common lawn grasses, like those listed below, are resistant to these chemicals when applied at the correct label rates.
However, Crossbow can injure or kill grass if it is applied incorrectly. Factors like using too high a concentration, spraying during stressful conditions for the grass, or accidentally treating the wrong type of grass can lead to damage. It’s crucial to understand that “grass” is a broad category, and Crossbow’s safety depends on the specific species.
Grasses Typically Safe From Crossbow
When used according to the label directions, Crossbow is generally safe for many established cool-season and warm-season turfgrasses. These grasses have a natural tolerance to the herbicides in Crossbow.
- Kentucky Bluegrass
- Perennial Ryegrass
- Tall Fescue
- Fine Fescues
- Bermudagrass
- Zoysiagrass
- Buffalograss
Grasses Sensitive To Crossbow
Some grasses, particularly certain warm-season varieties, are more sensitive to the triclopyr in Crossbow. Injury can range from yellowing (chlorosis) to severe thinning or death. Always check the product label for the most current safety information.
- St. Augustinegrass (Very Sensitive)
- Centipedegrass (Very Sensitive)
- Bahiagrass (Sensitive)
How Crossbow Herbicide Works
Understanding the science behind Crossbow helps you use it more effectively. It is a systemic, selective herbicide. Systemic means it is absorbed by the leaves and stems and moves throughout the plant’s vascular system to kill the entire plant, including roots. Selective means it is designed to target specific plant types (broadleaves) while sparing others (grasses).
The Role of 2,4-D
2,4-D is a common herbicide that effectively controls a wide range of broadleaf weeds like dandelions, clover, and plantain. It’s generally safe for most turfgrasses when applied properly.
The Role of Triclopyr
Triclopyr is particularly effective against tougher woody plants, vines, and brush like poison ivy, blackberries, and kudzu. It is the component that poses a greater risk to sensitive grasses like St. Augustine and Centipede.
Factors That Increase Risk Of Grass Damage
Even on tolerant grasses, damage can occur if application guidelines are ignored. Here are the key factors to control.
Application Rate and Concentration
Exceeding the recommended mix rate is a common cause of lawn damage. More is not better with herbicides. Always measure carefully and follow the label for your target weeds.
Environmental Conditions at Time of Spraying
Weather plays a huge role. Avoid spraying when temperatures exceed 85°F or during drought stress, as the grass is vulnerable and the herbicide can volatilize and drift. Also, do not spray if rain is expected within 24 hours.
Lawn Health and Stress
A lawn already stressed by disease, insect damage, heat, or lack of water is more susceptible to herbicide injury. Always ensure your grass is healthy and actively growing before any application.
Drift and Overspray
Wind can carry fine herbicide droplets onto desirable grass or landscape plants. Always spray on calm days and use a shield or a low-pressure, coarse spray to minimize drift.
Step-By-Step Guide to Applying Crossbow Near Grass
To safely use Crossbow in your lawn without killing the grass, a methodical approach is essential. Rushing the process often leads to mistakes.
Step 1: Identify Your Target Weeds And Grass Type
Confirm that the plants you want to kill are listed on the Crossbow label. Then, positively identify your lawn grass species. If you have a sensitive grass, consider alternative control methods.
Step 2: Check Weather Forecasts
Plan your application for a calm, cool day. Ideal conditions are temperatures between 60°F and 80°F, with no wind and no rain in the forecast for at least 24 hours.
Step 3: Prepare The Crossbow Mixture
Always follow the label. For spot treatment of weeds in grass, a common dilution is 1.5 fluid ounces of Crossbow per gallon of water. Use clean water and mix thoroughly in a sprayer.
- Add half the water to the sprayer tank.
- Add the measured amount of Crossbow.
- Add the remaining water and agitate.
Step 4: Apply With Precision
Use a handheld sprayer with a fan or cone nozzle for best control. For individual weeds, use a shield or a sponge applicator to paint the herbicide directly onto the weed’s leaves, avoiding any contact with the lawn grass.
Step 5: Post-Application Care
Do not water the treated area for 24 hours. Avoid mowing for 2-3 days to allow the herbicide to fully translocate. Monitor the area for weed die-back and any signs of grass stress.
What to Do If Crossbow Damages Your Lawn
Accidents happen. If you notice yellowing, browning, or thinning of your lawn grass after an application, take immediate action to mitigate the damage.
Immediate Actions
If overspray or spillage occurs on grass you want to protect, water the area deeply and immediately to dilute the herbicide in the soil. This can help reduce further uptake.
Long-Term Lawn Recovery
Herbicide injury can stress the lawn, but it often recovers with proper care. Your focus should be on nurturing the remaining healthy grass.
- Water deeply and infrequently to encourage deep root growth.
- Apply a balanced fertilizer to promote recovery once the grass shows new growth.
- Reseed or resod severely damaged patches once you are certain the herbicide is no longer active in the soil.
Alternatives to Crossbow for Weed Control in Lawns
If you have a grass type sensitive to Crossbow, or you’re simply uncomfortable using it, several effective alternatives exist.
Selective Herbicides For Broadleaf Weeds
For common lawn weeds, products containing only 2,4-D, dicamba, or MCPP are often safer for sensitive grasses than mixes containing triclopyr. Always check the label for grass safety.
Non-Chemical Control Methods
For an organic approach or for spot treatment, these methods can be very effective.
- Hand-pulling weeds, ensuring you remove the entire root.
- Using a vinegar-based natural herbicide for spot treatment on driveway or sidewalk cracks.
- Maintaining a thick, healthy lawn through proper mowing, watering, and fertilization is the best defense against weeds.
Frequently Asked Questions (FAQ)
Will Crossbow Kill Grass In My Lawn?
It might, depending on your grass type. Crossbow is generally safe for grasses like Bermuda, Fescue, and Bluegrass when used correctly. However, it can severely damage or kill sensitive grasses like St. Augustine and Centipede. Always identify your grass first.
How Long After Spraying Crossbow Can I Plant Grass?
You should wait at least 2-3 weeks before reseeding a treated area. For major renovation like sodding, it’s safer to wait 4-6 weeks. The triclopyr in Crossbow can persist in the soil and affect new seedlings.
Can Crossbow Kill Bermuda Grass?
Established Bermudagrass is very tolerant of Crossbow when applied at label rates for weed control. However, high rates or repeated applications can cause stunting or yellowing. Avoid spraying newly sprouted Bermuda grass.
Is Crossbow Safe For All Lawns?
No, it is not safe for all lawns. It poses a high risk to St. Augustinegrass, Centipedegrass, and Bahiagrass. You must check the product label for a list of tolerant turf species before application to avoid damaging your lawn.
What Weeds Will Crossbow Kill?
Crossbow is effective against a wide range of tough broadleaf weeds and woody plants. Common targets include poison ivy, blackberry brambles, kudzu, dandelions, clover, thistles, and wild violets. The label provides a full list.
Using Crossbow herbicide around your lawn demands respect for its potency. The key question, “will Crossbow kill grass,” has a nuanced answer that hinges on your knowledge and care. By correctly identifying your grass type, meticulously following the label instructions, and applying the herbicide with precision, you can successfully eliminate invasive weeds while preserving the health and beauty of your turf. Remember, when in doubt, spot-treat a small, inconspicuous area first or consult with a local extension office for advice tailored to your region and grass type.