Peonies are one of the most beloved flowers in the world, but a bit tricky to grow as they’re prone to fungal infections. But don't let that discourage you! In this blog post, we’ll guide you through the best fungicide for peonies so you can keep your garden looking vibrant and colorful all season long. So, make sure to stay tuned and discover how to protect your precious perennials from pesky diseases effectively!
Here are the best fungicides for peonies you can buy in 2025:
- Fungicide, Insecticide & Miticide Combo: Garden Safe 511038
- Best For Long-Lasting Disease Control: Bonide 811
- Best For Fast Result: Spectracide 100507462
- Best For Controlling Powdery Mildew: Daconil® 100523634
- Best For Controlling Canker: Earth's Ally Fungicide Treatment
- Best For Controlling Black Spot: BioAdvanced 701250
6 Best Fungicides For Peonies | ||
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Fungicide, Insecticide & Miticide Combo | Garden Safe 511038 | |
Best For Long-Lasting Disease Control | Bonide 811 | |
Best For Fast Result | Spectracide 100507462 | |
Best For Controlling Powdery Mildew | Daconil® 100523634 | |
Best For Controlling Canker | Earth's Ally Fungicide Treatment | |
Best For Controlling Black Spot | BioAdvanced 701250 |
Fungicide, Insecticide & Miticide Combo: Garden Safe 511038

- Ability to control and prevent many fungal diseases - fungicide, insecticide, and miticide combo
- Ready to use with no mixing required - a 24 fl. oz. spray bottle
- Garden-friendly – ability to be applied up to and including the day of harvest
- The product may leave a residue behind on surfaces
The Garden Safe 511038 is the best fungicide, insecticide, and miticide combo you can find on the market.
It is labeled for use on peonies, so it can be applied at the first sign of spring budding to prevent rust leaf spot diseases, anthracnose, and scab. In mid-summer, applications can be made to prevent powdery mildew.
The active ingredient in this product is triazole fungicide, which is the most widely used fungicide class in the world and is particularly effective at controlling fungal diseases in peonies.
This fungicide is locally systemic, meaning it moves up and down the plant but not into the leaf, and it inhibits an enzyme that plays a role in fungi sterol production.
Garden Safe 511038 Specifications | |
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Volume | 24 Fluid Ounces |
Active Ingredients | Clarified Hydrophobic Extract of Neem Oil. |
Highlight Features | fungicide, insecticide, and miticide combo a 24 fl. oz. spray bottle ability to be applied up to and including the day of harvest |
Looking for the best fungicide, insecticide, and miticide combo for peonies? Consider the Garden Safe 511038
Best For Long-Lasting Disease Control: Bonide 811

- Deliver long-lasting disease control – the active ingredient being Copper Octanoate
- Reliable - a patented formulation
- Help reduce future damage - Can be applied before signs of disease are visible
- Potential of causing severe eye irritation if not properly handled
- The product can cause injury to new growth
If you are looking for a fungicide that delivers long-lasting disease control, pick copper-based products. Our recommendation for you is the Bonide 811.
The active ingredient of this fungicide is Copper Octanoate at 10%.
These copper ions act as contact fungicides, and they are effective against a wide range of plant diseases by killing the cells of pathogens before they even have a chance to infect the plant.
They are also highly effective against bacterial diseases and stick to and remain active on plant surfaces, even during wet winter conditions.
Furthermore, the material can be used up to the day of harvest, ensuring long-lasting protection for your peonies.
Bonide 811 Specifications | |
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Volume | 16 Fluid Ounces |
Active Ingredients | Copper Octanoate (copper Soap) 10%. |
Highlight Features | the active ingredient being Copper Octanoate Can be applied before signs of disease are visible a patented formulation |
Compared to other contenders we tested, the Bonide 811 stands out for providing very long-lasting disease control.
Best For Fast Result: Spectracide 100507462

- Deliver fast results – Myclobutanil
- Not prone be washed off by rains – rainproof formula
- Must be applied every two weeks throughout the season
The Spectracide 100507462 is specifically designed to cure and prevent all common diseases on ornamental shrubs, flowers, and roses, including those that affect peonies.
It delivers fast results when used to treat a variety of fungal and bacterial diseases, such as powdery mildew, rust, black spot, and other common peony diseases.
As a great plus, the spray concentrate is rainproof, so it’s not easily washed off by rains. It can provide continuous protection against disease for up to two weeks.
Spectracide 100507462 Specifications | |
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Volume | 16 Fluid Ounces |
Active Ingredients | Myclobutanil |
Highlight Features | Myclobutanil rainproof formula |
Using the Spectracide 100507462, you don’t have to wait for so long. Its fast-acting formula can give you instant results.
Best For Controlling Powdery Mildew: Daconil® 100523634

- Kills, stops, and prevents powdery mildew - Chlorothalonil 29.6%
- Assured quality - Made in United States
- Easy to use and apply
- Wish the lid was tighter
- It has strong smell
What's so special about the Daconil® 100523634 is it provides 3-way control to stop and prevent many fungal diseases in peonies, including powdery mildew.
This concentrated fungicide features a built-in surfactant that helps it penetrate more deeply into the plant's roots where powdery mildew may be present. As a result, it offers more comprehensive control and greater protection against fungal infections.
Aside from powdery mildew, this product also helps control other diseases that can affect peonies, such as Coffee Berry Disease (CBD).
Daconil® 100523634 Specifications | |
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Volume | 2 Fluid Ounces |
Active Ingredients | Chlorothalonil 29.6%. |
Highlight Features | Chlorothalonil 29.6% Made in United States |
On the market for the best fungicide for controlling powdery mildew? Look no further. Try the Daconil® 100523634 now.
Best For Controlling Canker: Earth's Ally Fungicide Treatment

- Effectively control canker - citric acid
- Safe for pets, humans, and the environment - OMRI Listed
- Economical & Cost efficient - Concentrate formula
- Not work well in humid climates
Using a natural fungicide spray formulated with citric acid, the Earth's Ally Fungicide Treatment is incredibly effective at controlling canker.
The citric acid in the formula kills the spores that cause canker to hence protect peonies from fungal infections.
Rest assured, this active ingredient leaves no harmful residue on plants. It's also safe for pets, humans, and the environment.
Because the Earth's Ally Fungicide Treatment is broad-spectrum, it not just works on canker but also many other plant diseases, such as downy mildew, blight, leaf spot, etc.
Earth's Ally Fungicide Treatment Specifications | |
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Volume | 32 Ounces |
Active Ingredients | Sodium Acetate, Sodium Benzoate, Potassium Sorbate, Ethyl Lactate, Citric Acid, Lactose, Water |
Highlight Features | citric acid OMRI Listed formula |
If your peonies are struggling with canker, the Earth's Ally Fungicide Treatment is a fantastic solution for controlling this disease.
Best For Controlling Black Spot: BioAdvanced 701250

- Best for controlling black spot - Imidacloprid, Tau-fluvalinate, and Tebuconazole
- Easy to use - a pump-style tank
- Safe for both people and the planet - EPA Registration
- Directions are unclear.
We highly recommend the BioAdvanced 701250 for those seeking a fungicide that can help to control black spot.
This product contains a systemic formula that is designed to treat and prevent listed diseases in peonies. Its active ingredients are Imidacloprid, Tau-fluvalinate, and Tebuconazole, which are all effective fungicides for controlling black spot.
This product is also easy to use, with a pump-style tank.
Additionally, it does not contain any harsh chemicals, so it is safer for both people and the environment than many other products available on the market.
BioAdvanced 701250 Specifications | |
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Volume | 32 Fluid Ounces |
Active Ingredients | Imidacloprid, Tau-fluvalinate, and Tebuconazole. |
Highlight Features | Imidacloprid, Tau-fluvalinate, and Tebuconazole a pump-style tank EPA Registration |
If you want a fungicide for peonies that can control black spot effectively, the BioAdvanced 701250 is a great fit.
How To Choose The Best Fungicide For Peonies?
Consider The Climate In Which The Plants Are Grown
When choosing a fungicide to use on peonies, it is important to consider the climate in which the plants are grown.
If the fungus is active in cool climates, then a fungicide with broad-spectrum activity may be necessary. If the disease is active in warm climates, then a more specific fungicide may be required.
The most common type of fungicide is mancozeb, which is a dithiocarbamate fungicide that works by inhibiting the growth of fungi.
Mancozeb is best used when applied in late summer or early autumn before visible signs of disease appear. It has a wide range of activity against a variety of fungal diseases including powdery mildew, rust, and leaf spots.
Thiophanate methyl is another popular fungicide used to protect against plant diseases.
This fungicide works by disrupting the fungal cell walls, thus preventing the spread of disease. It is most effective when it is applied prior to visible disease symptoms, as it is not effective once the disease is established.
Thiophanate methyl is also known to be more effective when used in combination with other fungicides such as mancozeb.
Active Ingredients
The best active ingredients for each disease in peonies will depend on the particular conditions in which the plant is growing and the specific situation of the disease itself.
It is important to consider all factors before choosing the right active ingredients for each individual situation.
Take an example:
Botrytis is a fungal disease that can be managed through the use of fungicides, such as copper, captan, chlorothalonil (Daconil), mancozeb, maneb, sulfur, and thiophanate methyl.
These fungicides can be used to spray the plants when young tips break through the ground, followed by an additional application two weeks later and every 14 days thereafter until mid-June.
For ethylene damage, on the other hand, there are no specific active ingredients that can be used to treat the disease, but instead it is important to practice good management practices to prevent the disease from occurring in the first place.
Other Factors To Consider
There are some other factors that should be taken into consideration when choosing the best fungicide for peonies:
- The product should be approved for use on peonies.
- If used near your living area, make sure the product is not toxic to humans and animals
- Cost of the fungicide
- The convenience of the application. Make sure that the product is easy to apply.
Which Brands Make The Best Fungicide For Peonies?
Garden Safe
Garden Safe is a great brand for fungicides for two reasons. First, it is safe to use around children and pets. Second, it can be used to prevent and control black spot, rust, powdery mildew, and other listed insect pests and mites.
Bonide
Bonide has been providing safe and effective organic and natural gardening solutions since 1926. Its all-purpose fungicide products can be used on virtually any plant and can be used as a dormant spray to help protect plants from insect and disease infestations.
FAQs
When should you not use fungicide for peonies?
You should not use fungicide for peonies during mid-June or later, as the disease pressure will be lower.
How often should you apply fungicide for peonies?
It is generally recommended to apply a fungicide once in the spring, when new growth of peony tips breaks through the ground. Additionally, it may be necessary to apply fungal treatments throughout the growing season.
What happens if you use too much fungicide for peonies?
If too much fungicide is used on peonies, it can cause damage to the plant and its environment.
Too much fungicide can lead to reduced growth, yellowing leaves, stunted root systems, and even death of the plant.
Additionally, it can be toxic to beneficial soil organisms and cause runoff pollution into nearby water systems.
What time of day do you spray fungicide for peonies?
It is best to spray fungicide for peonies in the early morning or late evening when the temperatures are cooler and the sun is not as strong, as spraying fungicide during the hottest hours of the day may cause leaf burn.
Does rain wash away fungicide for peonies?
Yes, rain can wash away fungicide for peonies if the fungicide floats in the air.
To prevent this, it is important to apply liquid fertilizer or mix baking soda with dormant oil and insecticidal or liquid soap into the soil and make sure to water it thoroughly.
Conclusion
So we have walked you through everything needed to find the best fungicide for peonies.
Depending on the type of damage that needs to be treated, you may opt for a preventative fungicide treatment or even choose one specifically designed to treat existing fungal diseases.
With careful attention and regular observation, your precious peonies will remain healthy, beautiful blooms throughout the growing season.