In this newsletter you will find all information that is currently relevant to the crop of peonies. We trust that this information will help you in achieving a successful crop. Feel free to contact us for questions and remarks!

For a long time now you are receiving this newsletter from us. With information regarding the cultivation of peonies. Because we are always looking for ways to improve ourselves, we would like to hear from you how relevant this information actually is. What are things you would like to see differently and are there topics on which you would like to receive more information? We greatly appreciate any feedback, so please let us know!

Watering

Paeonia is a sensitive crop. The crop is not strong due to the fast growth after sprouting. The plant repels its weakest flowers when the growth is fast while the weather is bleak. Especially during cold nights the frost will be blamed for this, but a lack of water is most likely the main reason.  A sudden spell of warm weather during the stretching increases the risk too. Do not wait with watering until the soil is dry, but make it as pleasant for the plant as possible.

In the greenhouse and in the tunnel, the watering of the peonies is important for the final results. As said, the plant grows very fast. So there is a big chance that the plant growth is more important than the growth of the flower buds. The so-called choosing moment of the plant can be delayed by giving sufficient water. The plant will no longer repel its flower buds when they are large enough.

Click here for all the information regarding Watering.

Botrytis control

Because of its fast growth, the peony is hardly resistant to climate change. One of the resulting damages is almost certainly Botrytis. The fungus will especially keep causing problems when the peony doesn’t get protection during growth. In that critical period extra sprayings of the peonies are absolutely necessary. Good and effective resources are Teldor, Kenbyo, Luna and Switch. The best result is obtained when the buds are wet with dew. The fungicide then flows around it more easily. You can also use a good spreader. And spray from both sides.

When Luna Sensation is being used just before the flowers start to bloom, it means that there will be a very low percentage of Botrytis in the flower buds. But it also ensures a remarkably low failure in the cold store.

In terms of a weak crop, don’t spray for two days after night frost.

Phytophthora

A quite new infestation in peonies is known as Phytophthora. An infection which takes place through injuries under humid circumstances. The fungus can survive in plant tissue and in the soil for years.

The first infestation can be recognized through black and weak leaves in the crop. When there is an infection by Phytophthora in the spring, brown to gray black spots will arise on the stem parts. In that case the branches will come up like some sort of black brackets and they will not grow further than ten centimeters. After infection it is almost impossible to remove.

Places of infection will most of the time feel spongy and soft, where the marrow will be dark brown and wet rot. Kansas and Duchesse are examples of species who are sensitive to Phytophthora.

The elements Manganese and Zinc offer resistance against Phytophthora.

To prevent this, from the moment the flower rises till the mulching, you have to spray with, for example, copper, Moancozeb, Axidor (works systematically), or the new fungicide Ranman Top.

Click here for all the information regarding Phytophthora.

Leaf spot diseases

Leaf spot diseases causes more and more problems in the crop of peonies. Leaf spot fungi and Botrytis create different kinds of leaf spots on the peony (as you can see on the pictures below). Both fungi flourish under warm and humid circumstances and they survive on crop residues.

Measures:

  • Use healthy starting material
  • Remove crop residues after the mulching/mowing
  • Watering in the morning so that the crop will be dry during the night
  • Spray preventively with Daconil, Flint, Ortiva or Switch. Switch regularly between these products to prevent resistance

Click here for all the information regarding Leaf spot diseases.

DCM

Color of the crop

A peony can get a lighter color during spring because the soil is still cold around that time and the root is not active enough. While the temperature rises and the crop grows fast. Or because of a deficiency. This may be caused by a shortage of spore elements. Especially iron and manganese can play an important role in that situation.

Click here for all information from DCM.

KaRo

Peonies grow from nothing to a full grown plant in a very short time. Which cost a lot of energy. The plant needs a range of main and spore elements to make this possible. These elements are not always as readily available through the soil.

Click here for all information from Karo.

When planting peonies in fall 2021; the benefits of extra investing in 3-5 eyes compared to 2-3 eyes:

Number of stems/flowers per plant (2-3 or 3-5 eyes):   

Variety Year Amount of stems Amount of stems
    2-3 eyes 3-5 eyes
Sarah Bernhardt Planting in fall: 2021    
  Spring              2022 0 0
  Spring              2023 0 3
  Spring              2024 4 7
  Spring              2025 6 8
  Spring              2026 7 9
  Spring              2027 7 9
  Spring              2028 8 9
    32 45

Have a look at our product pages for more information regarding our cut flowerspot plants and peonies.

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