Mixing triclopyr at a rate of 6 ounces per gallon of water effectively controls woody brush species. But the answer to the question of how much triclopyr per gallon of water isn’t always that simple, because it depends on the specific product you bought and what you are trying to kill. You need to read the label on your jug, but we will break down the most common mixing scenarios for you here.
This guide will help you get the mix right the first time. We will cover different concentrations for different jobs, from spot spraying small saplings to tackling dense pastures.
How Much Triclopyr Per Gallon Of Water
When you search for “how much triclopyr per gallon of water,” you will find that the answer varies. The most common mixing rate for general brush control is between 4 and 6 fluid ounces per gallon of water. However, you must check your specific brand, because some products are concentrated at different strengths.
For example, a standard 4-pound per gallon formulation is different from a 3-pound per gallon one. The “pound” refers to the amount of active ingredient, which is the chemical that does the killing. If you use the wrong amount, you might not kill the plant, or you could damage desirable trees.
Understanding The Active Ingredient
Triclopyr is a systemic herbicide. This means the plant absorbs it through the leaves and moves it down to the roots. That is why it is so good at killing stubborn roots that want to resprout.
You will usually see triclopyr sold as either “triclopyr amine” or “triclopyr ester”. The amine form is less volatile and is often safer to use near non-target plants. The ester form penetrates waxy leaves better but can volatilize in high heat.
Always check the label for the specific “active ingredient” percentage. A product with 60% active ingredient will need less per gallon than a product with 40%.
General Mixing Rate For Spot Treatment
For most homeowners dealing with small brush, brambles, and poison ivy, the spot treatment rate is your go-to. This is the rate you use when you have a hand pump sprayer and you are hitting individual leaves.
- Mix 6 ounces of triclopyr concentrate with 1 gallon of water.
- Add 1 ounce of a non-ionic surfactant to help the chemical stick to the leaves.
- Spray the leaves until they are wet, but not dripping.
This mixture is strong enough to kill most broadleaf weeds and woody vines. It is the most common answer to the question of how much triclopyr per gallon of water you need for a backpack sprayer.
Broadcast Application Rates
If you are treating a large pasture or a field, you will likely use a tractor-mounted boom sprayer. In this case, you are not mixing per gallon but per acre. However, you still need to know the per-gallon math to calibrate your sprayer.
For broadcast applications, the label usually suggests 1 to 2 quarts of product per acre. If you are using 20 gallons of water per acre, that works out to roughly 1.6 to 3.2 ounces per gallon. This is much lower than the spot treatment rate.
Do not use the broadcast rate for spot spraying. It is too weak to kill established brush. You will just burn the leaves and the plant will come back.
Cut Stump Treatment Mix
Another common method is the cut stump treatment. This is where you cut a tree down and paint the herbicide on the fresh cut. This prevents the stump from sprouting new growth.
For this method, you need a much stronger concentration. Mix triclopyr at a rate of 1 part herbicide to 1 part water. You do not need a surfactant for this because you are painting it directly on the wood.
This method is very effective for invasive trees like buckthorn or honeysuckle. You can use a cheap spray bottle or a paintbrush to apply the mix.
Step-By-Step Mixing Instructions
Mixing herbicides is not complicated, but you must be precise. Here is a simple step-by-step guide to get the job done right.
- Fill your sprayer tank halfway with clean water.
- Add the correct amount of triclopyr concentrate. Use a measuring cup that is only used for chemicals.
- Add the surfactant if you are using it.
- Close the tank and shake it well to mix the solution.
- Fill the tank the rest of the way with water.
- Shake again and you are ready to spray.
Always add the herbicide to the water, not the other way around. This helps the chemical mix evenly and prevents it from settling at the bottom of the tank.
Choosing The Right Surfactant
A surfactant is a “sticker-spreader”. It helps the herbicide stick to the leaf surface and spread out evenly. Without it, the liquid will bead up and roll off waxy leaves.
Most labels recommend adding a non-ionic surfactant at a rate of 1 to 2 teaspoons per gallon. Do not use dish soap, as it can create too much foam and clog your sprayer.
If you are spraying in wet conditions, you might need a “crop oil” instead. This helps the chemical penetrate the leaf cuticle better in cooler weather.
When To Apply Triclopyr
Timing matters just as much as the mix ratio. The best time to spray triclopyr is when the plants are actively growing. This is usually in late spring or early summer.
For woody brush, the best window is after the leaves have fully expanded but before the plant starts to harden off for winter. Spraying in the fall can also work, as the plant is pulling nutrients down to the roots, which pulls the herbicide down with it.
Avoid spraying on windy days. The drift can kill your ornamental flowers or your neighbors garden. Also, avoid spraying if rain is expected within 4 to 6 hours.
Water Quality And Ph
Most people don’t think about water quality, but it can affect how well the herbicide works. If your water is very muddy or has a high pH, it can tie up the chemical.
If you have hard water, consider adding an ammonium sulfate adjuvant. This helps keep the triclopyr in a form that the plant can absorb. You can buy this at most farm supply stores.
Using clean, filtered water is always the best option. Rainwater is excellent if you can collect it.
Specific Target Weeds And Rates
Different plants require different doses. While the 6-ounce rate is a good general rule, you can adjust it for specific tough weeds. Here is a quick guide to common targets.
Poison Ivy And Poison Oak
For poison ivy, you want to use the high end of the rate. Mix 6 to 8 ounces per gallon of water. These plants have a waxy cuticle that is hard to penetrate.
Spray the leaves thoroughly, and wait about two weeks. You will see the leaves curl and turn brown. You may need a second application for large patches.
Do not burn poison ivy that you have sprayed. The fumes can be toxic.
Blackberry And Brambles
Blackberries are tough. They have thick canes and a deep root system. Use 6 ounces per gallon for these.
Spray in the late summer when the plants are moving energy to the roots. This will give you the best kill rate. You will likely need to retreat the area next year for any seeds that sprout.
Invasive Trees Like Buckthorn
For small buckthorn, you can use the foliar spray at 6 ounces per gallon. For larger trees, you should use the cut stump method we mentioned earlier.
If you are doing a basal bark treatment, you will need to mix triclopyr with an oil carrier. This is a different mix entirely, usually 20 to 30 percent triclopyr in oil.
Safety Precautions And Equipment
Herbicides are safe when used correctly, but you must protect yourself. Always wear long sleeves, pants, and chemical-resistant gloves.
Wear eye protection to prevent splashes. If you get the chemical on your skin, wash it off immediately with soap and water.
Use a dedicated sprayer for herbicides. Do not use the same sprayer you use for applying fertilizer or weed killers to your lawn, as residue can harm your grass.
Cleaning Your Sprayer
After you finish spraying, you need to clean your equipment. Rinse the tank with clean water and spray it through the wand to clean the lines.
Add a small amount of ammonia to the water to neutralize the triclopyr. Let it sit for a few minutes, then rinse again. This prevents corrosion and keeps the sprayer working for years.
Dispose of any leftover mixed herbicide properly. Do not pour it down the drain or on the ground. It is best to mix only what you need for the day.
Common Mistakes To Avoid
Many people make simple errors that reduce the effectiveness of their spray. Here are the top mistakes to avoid.
- Using too little water. If the leaves are not wet, the chemical cannot be absorbed.
- Spraying in the heat of the day. The chemical can evaporate before it is absorbed.
- Mixing too much and storing it. Triclopyr degrades quickly once mixed with water.
- Ignoring the label. The label is the law, and it has the specific rates for your product.
If you follow the label and these tips, you will have great results. The key is to be patient and let the chemical do its work.
Frequently Asked Questions
Here are some common questions people have about mixing this herbicide.
Can I use triclopyr on my lawn?
Yes, but you need to be careful. Triclopyr will kill broadleaf weeds like clover and dandelions, but it will not harm your grass. Use a lower rate of about 3 to 4 ounces per gallon for lawn spot treatments.
How long does triclopyr take to work?
You will see visible effects in about 7 to 14 days. The plant will start to twist and curl. Full death of the roots can take up to 4 weeks.
Is triclopyr safe for vegetable gardens?
No, you should not use triclopyr in a vegetable garden. It can persist in the soil and damage your crops. Use it only on non-crop areas like fence lines and pastures.
Can I mix triclopyr with other herbicides?
Yes, triclopyr mixes well with glyphosate (Roundup) for a broader spectrum of control. However, mixing them increases the strength, so you should reduce the rate of each by half.
What happens if I use too much triclopyr?
If you use too much, you might kill the plant too fast. This means the chemical does not move to the roots, and the plant can resprout. You might also damage nearby trees if the chemical runs off.
Mixing triclopyr correctly is the key to successful brush control. Remember the 6-ounce rule for most spot treatments, but always defer to the specific instructions on your product label. With the right mix and timing, you can clear out that overgrown area and keep it clear for good.
Take your time, measure carefully, and wear your safety gear. Your efforts will pay off with a cleaner, more manageable landscape.