Peony Care Newsletter September 2016

Preparations for a good crop!

Herewith we send you our Peony Newsletter for September. With special attention to:

  • Mowing crop
  • Leaf nematodes and shelf buttons
  • Botrytis control
  • Weed Control
  • Quickdown and Centurion Plus
  • Yellow fruit tree Cicade
  • Planting of new Peony plants
  • Cooling temperature during storage

We trust that this information will be helpful in achieving a successful crop. For questions or remarks please feel free to contact us.

Provide sufficient water in greenhouses and tunnels in order to allow the soil to take in all the fertilizers. Drought during this time will damage the flower production for next year.
Therefore an active soil life is important, moist soil and proper organic matter are very important for the absorption of fertilizers.

Mowing crop

With Peonies it is common that the crops will be spared until at least mid. September. The saving of green parts = the saving of growth. Even a dying plant ensures growth of the tuber. In fact, the greatest increase in underground parts of a Peony takes place during the dying of the plant.

Leaf nematodes and shelf buttons

For limiting nematodes and flat knots in Peonies in the coming harvest, consider cutting off your crop in early September.
Leaf nematodes hibernate in dead foliage on the ground and in the young growth points of the Peony. Mow the crop relatively early in the fall and remove crop residues. Do this only in dry conditions.


Botrytis control

Although the growing season has only just ended, preparations need to be done to have a good crop in the spring. An important part of the preparation is the control of Botrytis which already starts right after the summer.
When this check does not get done at the end of the summer it is possible that the Botrytis mould can grow in the winter which can cause the Peonies to fall over in spring. This autumn control is just as important as the spring control of botrytis. Also remove crop residues because of a potential danger of Botrytis and nematodes.
Cutting height:
Research shows that a Botrytis inhibitory effect occurs when the crop is not cut too short in the fall. This will reduce the chance of the Peonies falling over in the next spring. A cutting height of 10 CM above the ground is better for the crop than to cut it directly above the ground.

Weed control

When it is not possible to keep the parcel free of weeds it is important of mow the crop, specially when a large part of the crop has already died. It has no use to keep the crop when it is overgrown by weeds.

Leaf nematodes can infect the parcel by lifting on weed(seeds).

That’s why it is important to have all the weeds gone before the winter. The Peonies are extremely sensitive of Roundup. Specially with grass in between the Peonies it should never be used. Roundup will be absorbed via the roots of the plant. Basta can be used for a parcel full of weeds. Potentially add some Urea to Basta.  When there are a lot of grass types growing on and in between the beds it can be useful to add small amounts of Chlorpropham to Basta.

Quickdown and centurion plus

Quickdown and Centurion Plus have been added as a herbicide in the open air cultivation of perennials and floricultural crops. Quickdown is a contactherbicide against one year broadleaf weeds. Centurion Plus is effective against various grass types. 

Quickdown can be used against young weeds. It does not work systematic. Quickdown has a quick result and is strong on small nettles and field violets which sometimes can be hard to control with other herbicides.
Grasses can not be controlled by Quickdown. A combination of Quickdown with Centurion Plus is a possibility when grasses also occur.
Quickdown has to be applied in between the crop with a screen to avoid drift to the crop or adjacent parcels!
Always read the description first when you don’t have experience with the above named products. After reading prepare a test spraying on a small scale.

Yellow fruit tree cicade

The yellow fruit tree cicade appears in Peonies which are more and more grown in the greenhouses. Because the cicades only appear after flowering they are not harmful in small quantities. Most Cicades are seen in August. In September Cicades will lay their eggs. Spray with Admire in August, but note that most likely you will never get rid of these insects in one time.


  1. Fytaforce Soil for directly increasing soil life by spraying a liquid mixture of fungi, bacteria, yeasts and protozoa
    Fytaforce Soil is a unique, high performance organic fertilizer with a concentrated mixture of beneficial micro-organisms that occur in the soil under natural conditions. It is specifically designed for application at outdoor cultivation and ensures that the natural balance of micro-organisms is restored on and around the plant. In a natural balance, the plant is more resilient and vigorous. In addition, it stimulates the formation of humus and the mineralization in soil.

  2. Photo-Finish for the empowerment of the crop
    Photo-Finish is a multifunctional leaf fertilizer which contains a lot of silicium and potassium which reinforces the cells and increases the sugar level. It also contains kelp (seaweed), humic acid, fulvic acid, selected trace elements and various growth-stimulating plant extracts. Photo-Finish produces a protective layer on the cell walls which makes it an unattractive leaf surface for insects and resistant to fungi.

  3. Root & Shoot for the recovery of the crop and the development of new eyes
    Root & Shoot is an effective product to promote the development of crops, both above the ground and below ground. It is a special combination of fertilizers, growth promoters and vitamins which stimulates root growth and shoot development. Root & Shoot can be used as an aid in times of stress (frost, hail, heat, wind, transplanting etc.), so also after cutting the Peonies. 

For more information contact:

Marco Culurgioni

Danny Rood

Planting time of new Peony plants

The best time to plant Peonies is in the autumn. The cooler period makes for a better rooting of the plant. This results in the plant having more crops in the coming spring. Try to plant the Peonies at least before mid. November. Peonies that are planted in autumn should not be refrigerated during the storage. When the cooling period takes too long the plant will start to grow during the winter which will damage the plant in the winter or in early spring.

Cooling during storage

In September, October and November the Peonies are being harvested and stored till it is time for planting.

  • Cooling temperature = Outdoor temperature
  • When it is not clear if the plants are being planted before the winter then the plants must be stored in a temperature of above 5 degrees Celcius to prevent the plants from sprouting.
  • Until November: No cooling, outdoor temperature is enough
  • November and December: Store at 2 degrees Celcius
  • January: Store the plants well packed at 0 till -2 degrees Celcius.

Don’t point a fan directly to the plants otherwise they will dry out faster. The dehydration of the roots can be disastrous for Peonies.

Green Works Care™

After extensive testing and research together with various institutions in The Netherlands and abroad we introduce Green Works™ Care for peonies.
The difference between a warm water treatments and Green Works Care™ became very clear after our tests, read the benefits of Green Works Care™ below.


  • No damage caused as by warm water treatments
  • Because the treatment is carried out in-house the plants are less dehydrated
  • Special preventive treatment against root knot nematodes and leaf nematodes
  • Plants retain more growing power and vigor
  • Plant grows better in the first year
  • Producing more flowers in the second and third year


When interested or if you have any questions please contact: 

Check out the Peony assortment per variety: