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The Daily Insight

Why are my peonies turning black

Author

Marcus Reynolds

Updated on May 08, 2026

Black spots on peony leaves are caused as a result of watering the peony bushes from the top. Peony bushes absorb water through soil. They don’t need water to be sprinkled on their surface. If done so, they become an ideal environment for germination and growth of fungi.

Why does my peony look burnt?

If your peonies look like they have burn spots on them, the problem is most likely leaf blotch, which is common in warm, wet weather. It is caused by a fungus called Cladosporium paeoniae, which appears as dark reddish purple blotches or spots on peony leaves in mid- to late summer.

How do you revive a dying peony?

If any tubers have been dislodged from the soil, rebury them. Make sure that you do not bury them too deeply, however, as peony tubers need to be near the surface. As long as the tubers are replanted correctly, they should heal themselves and will recover fully for the next year.

How do you treat peony blight?

When Botrytis blight of peony is a problem, avoid the use of dense, wet mulches and apply the first fungicide spray in early spring just as the red shoots begin to push up out of the ground. With continuous inspection and careful sanitation gray mold can be effectively managed.

What's wrong with my peony?

Peonies suffer from very few pest and disease problems. Nevertheless, they sometimes get fungal diseases, such as botrytis blight, which you describe. Other similar problems include blackened and/or rotten stems, withered buds, gray mold near the base of the plant.

What does peony blight look like?

On peonies afflicted with botrytis, the young shoots rot off at ground level when they are 5 to 8 inches tall. The stems often have a water-soaked, cankerous appearance. The leafy shoots wilt suddenly and fall over. The rotted portion of the plant will become covered with a soft brown or blackish mass of spores.

What do you do with a dying peony?

Peony flowers begin fading in early summer. Removing the dead blooms, called deadheading, improves the plant’s appearance and encourages healthy growth because the peony won’t waste energy trying to form seed. Make the cut behind the swollen base of the spent bloom to remove the entire seed structure.

How do I stop peony blight?

To prevent Phytophthora blight, plant peony in well-drained soils and thin crowded plantings. If disease symptoms appear, destroy infected plant parts. Peony plants with rotted roots need to be removed together with the adjacent soil. Fungicides may help control the disease in situations where the roots are not rotted.

What does botrytis blight look like?

Botrytis blight causes buds and flowers to develop abnormally and turn brown. Flowers may have irregular flecks and brown spots; older flowers tend to rot quickly. Soft, brown spots appear on leaves, stem, and flowers following a cool damp period.

Is Miracle Gro good for peonies?

Peonies should be fed in early spring and again after they bloom. Avoid high nitrogen fertilizers like Miracle-Gro; too much nitrogen will give you great foliage but not much bloom (and weak, floppy stems). The best food for peonies is bone meal and potash; that’s why we use Espoma Bulb-Tone.

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Can you overwater peonies?

Avoid watering peonies overhead. The moisture on the leaves can encourage the formation of powdery mildew and other fungal diseases. If you must water on top of the foliage, do so when the plant has time to dry before night.

Why is my peony plant dying?

Their biggest issue usually occurs with various fungi, which cause several common peony diseases. During wet growing seasons, botrytis blight can develop. … Peony wilt is another disease caused by a fungus. Typically when this fungus is present in soil, it infects the plant, causing just a few stem tips to wilt.

What does peony wilt look like?

You may see the following symptoms: On leaves: Irregular patches of dead brown tissue, which can spread under suitable wet conditions to cause leaves to collapse. On leaf stalks and flower stems: The fungus causes patches of infection which leads to the collapse of the leaves or buds.

Will my peonies come back?

Peonies are perennials that come back every year to take your breath away. In fact, the plants may live longer than you do—some have been known to thrive for at least 100 years.

How do you treat peony measles?

To manage peony leaf blotch, cut the stems at ground level in the fall or early spring. Rake the area before new shoots appear. Fungicides are available to help control the disease, but must be used in combination with other management practices.

Why do peony flowers turn brown?

The brown areas you are seeing on your flowers are most likely the result of a fungus. The most common fungal disease on peonies, especially herbaceous peonies like Coral Charm, is botrytis blight (Botrytis cinerea). Botrytis blight can cause flowers to become discolored.

What is a good fungicide for peonies?

The recommended treatment is to spray a fungicide every 7 to 10 days from the time the new shoots emerge until flower buds form. Mancozeb is supposed to be one of the most effective. Chlorothalonil (Daconil) is another commonly available fungicide that can help slow blight on peonies.

What is the best fungicide for botrytis?

We have found chlorothalonil (Daconil, Syngenta Professional Products, and Spectro, Cleary Chemical), fenhexamid (Decree, SePRO), fludioxinil (Medallion, Syngenta Professional Products) and iprodione (Chipco 26019 and 26GT, Bayer Environmental Science) to be the most effective fungicides for prevention and eradication …

How do I get rid of botrytis?

  1. Prune all the parts affected, for this using sterilised (with alcohol) pruning scissors to remove the infected buds, at least 3 cm below the infected area. …
  2. Destroy the infected part. …
  3. Sterilise the tools used. …
  4. Ventilate your room properly.

What fungicide kills Botrytis?

Mycostop, a biological fungicide approved for organic use, has shown suppression of the disease. Direct spray (5 gm/ 50 liters of water) to susceptible leaves, flowers and fruits to point of run-off. Apply every 2-3 weeks, or as needed depending on disease pressure.

What is botrytis blight in peonies?

Also known as gray mold, botrytis blight is caused by a fungus which, while unsightly and concerning, is not deadly. In peony plants, either Botrytis cinerea or Botrytis paeoniae fungus is the culprit. … When infected, peony buds will form but turn brown and die before they are able to open.

Do peonies like sun or shade?

Herbaceous peonies prefer at least 8 hours of full sun. They will grow in partial shade, but they will not flower as readily. The only expections are some of the infrequently grown Asian woodland species, which require part shade.

Do peonies like Epsom salt?

Control of botrytis in peonies is a long term battle. … Add Magnesium (Epsom salt) to the Botrytis spray to harden off the plants. In the fall the fungus will form winter spores which will winter over in between the soil and air.

What is the best plant food for peonies?

A bulb fertilizer, perennial fertilizer, or 10-20-20 is a good option. Use a fertilizer low in nitrogen to prevent the peony from putting up too much dense, leafy growth and to encourage blooms. Fertilize first thing in the spring, when you see new shoots starting to come out of the ground.

How much sun and water do peonies need?

Peonies need at least 6 to 8 hours of sun each day, though some protection from hot afternoon sun in zones 8-9 is helpful. Choosing an area with good air circulation is essential as well, to help prevent fungal diseases.

Can peonies get too much sun?

Light. A common question that arises when planting peonies is, “Do Peonies need full sun or shade?” Peonies should be planted in an area that receives full sun. … On the other hand, too much sunlight can also be harmful, so ensure they are planted in an area that gets some afternoon shade.

Do peonies like wet soil?

They like full sun and moist, well drained soil. They don’t like shade or competition from tree roots, weeds or other plants. Give them enough room to grow. A mature peony can be five feet in diameter.

How often do you water new peonies?

Water your peony plants immediately after planting so that the soil settles well around the roots. During the spring months, there is usually enough moisture in the ground for peony plants, but if several weeks pass without rain, give them a good watering once every two weeks.

How do you keep peonies blooming all summer?

When you’re ready to have a blossoming peony, remove the bud from the fridge, remove the plastic wrap from the stem, and place it in a vase with room temperature water. Your peony should bloom within 8 – 24 hours. Peony buds will last in the fridge for 8 – 12 weeks. Enjoy!