Can You Use Fungicide and Fertilizer at the Same Time?

You can apply fungicide and fertilizer simultaneously if you are applying a fungicide that needs to be watered into your lawn. Granular fertilizer requires water to break it down and cause it to enter the soil. If you are using a fungicide that is also activated by water, it will benefit from this process. However, some fungicides must be left to dry on plant and grass leaves to be effective. If you are using a fungicide that does not specifically state it must be watered in after application, do not apply it at the same time as fertilizer.

What Fungicide Can be Applied at the Same Time as Fertilizer?

A fungicide that must be watered in to be effective, such as this product, can be applied at the same time as fertilizer. This is because fertilizer must be watered in after application to begin to feed the soil. If your fungicide also requires water to activate, it will pair well with fertilizer. Granular fungicides are best for this purpose.

  • Apply a fungicide at the same time you spread fertilizer.
  • Only apply fungicide at the same time as fertilizer if the fungicide must be watered in to activate.
  • Choose a granular fungicide for this purpose.
  • Granular fertilizer and fungicide can be mixed together in a spreader and applied simultaneously.

To save yourself time and make the job easier, measure out both the fertilizer and fungicide required for your yard, mix them together thoroughly, and pour them into your lawn spreader. Then, you can spread both at the same time, taking care of two jobs at once.

What is the Best Fertilizer to Mix with Fungicide?

Use a granular fertilizer to mix with your granular fungicide. Both products require watering after application, so apply them together, then water them into your lawn to feed your grass and kill fungus. The best lawn fertilizers you can mix with fungicide are:

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Once you have spread both fertilizer and fungicide, water them in with 0.5 inches (1.25 cm) of water. This typically takes about half an hour with a standard sprinkler system.

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What Fungicide Should Not be Mixed with Fertilizer?

Avoid using liquid fungicides for at least 3 days before or after fertilizing. Although some lawn fungicide products tout that they are rainproof after a few hours, extended watering may cause some runoff, or cause fungicide to leach into the soil, where the active ingredient in the fungicide is not helpful.

  • Do not apply a liquid fungicide treatment less than 3 days before or after you fertilize.
  • Watering required to water the fertilizer into your yard may wash off some liquid fungicides, making them less effective.

If you want to apply fungicide and fertilizer together, stick to granular products. Since both the fungicide and fertilizer will benefit from watering, it’s a win-win situation. There won’t be any risk of diluting your fungicide.

How Long Should You Wait to Fertilize After Applying Fungicide?

Wait 3–5 days after applying a liquid fungicide before spreading fertilizer in your lawn or garden. This will prevent watering (which is required to activate your fertilizer) from interfering with your fungicide application. If you’ve applied a granular fungicide, you can apply fertilizer on the same day.

  • Wait 3–5 days after applying liquid fungicide before spreading fertilizer.
  • If you have applied a granular fungicide, there is no need to wait to fertilize.
  • Waiting between fungicide and fertilizer applications can be beneficial so you can observe the effects of each product.

When possible, it is good practice to allow 1–2 weeks between fungicide and fertilizer applications. This allows you to see the impact of the different applications on your lawn. The right fertilizer may green up your grass, helping it recover from the nutrient-deprived discoloration that could be mistaken for lawn fungus or other common diseases.

Can You Mix Copper Fungicide With Fertilizer?

It is not advisable to mix a liquid copper fungicide with fertilizer. Most copper fungicides require at least 12 hours of dry conditions following application in order to be effective. You will want to limit watering via sprinkler for 3 days following a copper fungicide application. In contrast, it’s best to water directly after fertilizing to pull nutrients into the soil. Wait 3–5 days after applying a copper fungicide before you fertilize.

Will Fertilizer Make Fungus Worse?

Fungal disease attacks lawns that are suffering from too little fertilizer as well as lawns that have been overfertilized. If your lawn is stressed from drought, fertilizer burn, poor soil pH, or nutrient-poor soil, it is much more likely to develop a fungal disease, such as brown patch disease or lawn rust. By performing lawn maintenance with proper fertilizer timing and application, you can provide your lawn with nutrients to help it resist fungal infection.

  • Too much or too little fertilizer can both lead to fungus in your lawn.
  • Drought, poor soil quality, and fertilizer overload all put your lawn at risk for fungus invasion.
  • Help your lawn resist fungus by using this slow-release, non-burning fertilizer.

In order to prevent fungal infection caused by too much fertilizer, use a slow-release, organic fertilizer. This is especially true during early spring green-up and the hottest portions of the summer when lawns can be damaged by overapplication of high-nitrogen fertilizer.

Does Fertilizer Kill Fungus?

Fertilizer will not kill lawn fungus on its own. Any lawn that is currently afflicted by a common lawn disease should be treated with an effective fungicide. Once your lawn has recovered, make certain your lawn is on a proper maintenance schedule. A well fertilized, strong lawn will resist fungus in the future.

  • Fertilizer will not kill fungus. Use a lawn fungus control product to eradicate the fungus.
  • Slow-release fertilizer applied on a proper schedule will help your lawn grow stronger and resist fungal diseases.
  • In addition to fertilizing, practice proper mowing, watering, aeration, dethatching, and soil-monitoring practices to encourage your lawn to resist disease.

Some ways to prevent fungus from attacking your lawn are to establish a fertilizer schedule, water your lawn deeply 2 times per week, aerate and dethatch as necessary, and monitor soil pH. The more you do to maintain your lawn, the lower the chance is that it will be invaded by fungus.

Is it OK to Apply Fungicide and Fertilizer at the Same Time?

If you are using a granular fungicide, you can apply it at the same time as granular fertilizer. This combination works well together because both products are activated by watering your lawn after application. Measure both your fungicide and fertilizer before mixing them together. Then, use a broadcast spreader to apply them evenly to your lawn. If you are using a liquid fungicide, it is best to wait 3–5 days after application before spreading fertilizer.

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