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!

In this newsletter you will find all information that is currently relevant to the crop of peonies. We trust that this information will be helpful in achieving a successful crop. Feel free to contact us when you have questions or comments!

It is important that enough water will be available for the plant in greenhouses and tunnels to take up the fertilizers. Drought in this period will damage the flower harvest for the next year. An active soil life is very important; moist soil and a correct organic matter level are very important to improve the taking in of the above mentioned fertilizers.

Cutting of the crop

The period after flowering can be seen as part of the crop. A strong plant is better at withstanding the winter and it grows easier in the spring. With peonies it is customary to spare the foliage until at least mid-September. The continue growing of green parts means more growth. Even a crop going on dormancy ensures growth of the tuber. The fact is, the strongest growth of underground parts of the peony occurs during the withering of the foliage.

Leaf nematodes and rose buds

To limit leaf nematodes and rose buds for the coming harvest season, you can consider to cut off the foliage in early September. Leaf nematodes hibernate in, amongst other things, dead leaves on the ground and in the young growth points of the peony roots. Therefore, cut off the foliage relatively early in autumn and remove the foliage residues. Only do this with dry weather.

Botrytis control

The growing season has just passed, but preparations are already necessary to regain a good crop in the coming spring. Botrytis control, which will start in late summer, is an important part of that.

It is important to carry out Botrytis control with Collis, amongst other things, after mowing. To kill the wounds on the plant and the spores present on the ground. These spores will eventually become winter spores and they will cause collapsing of stems in the spring. Therefore, spraying in the fall is just as important as spraying in the spring. And also remove crop residues in connection with a possible Botrytis and nematode infection.

Click here for all the information regarding Botrytis control.


It is wise to mow the foliage when it isn’t possible to keep the plot free of weeds. Especially if it already largely has died back. Of course it makes no sense to grow a crop if it already has been overgrown by weeds.

Leaf nematodes can infect the plot by hitchhiking on weeds(seeds).

Before the winter it is therefore necessary to make sure that weeds are completely gone. But peonies are extremely sensitive for RoundUp. This herbicide, especially in combination with bluegrass, can never be used in the peony. Because the herbicide will get absorbed through the roots.

Yellow Fruit tree Cicada

In the greenhouse, the number of peony crops with Yellow Fruit tree Cicadas rises. Because these Cicadas emerge only after flowering, they are not harmful in small numbers. Most Cicadas can be seen in August. In September the Cicada lays eggs. Normally, control of this problem takes place in August, but please note that you probably never get rid of this plague at once.


Adult crane flies suck just a little bit of nectar. But the larvae of the crane fly, also known as leatherjackets, are much more voracious. They are relatively large, soft and fat and they eat of various plants. Including the stems of the peony just below the ground.

Way of life:

With the crane fly, six stages of development can be distinguished:

  • One egg stage
  • Four larval stages
  • One adult stage

Click here for all the information regarding Leatherjackets.


Soil with organic matter

Because many stems have been cut and the remaining crop is mown and maybe even removed from the plot, you can practically call it robbery that takes place on the soil every year. This can be corrected through a so-called Vigro ReceptMix. This mixture is plot-specific and is determined by the SoilBalanceAnalysis or the so-called Fertilizer Indicator from Eurofins.

Click here for all information regarding KaRo.

Green Works Care™

Green Works developed an effective and environmentally friendly method for the control of nematodes in peonies. In collaboration with institutes at home and abroad, we introduce Green Works Care™ for peonies. This revolutionary treatment is only available through Green Works. The research took a couple of years and the treatment has been extensively tested in that period. The result is an attractive alternative to the standard water treatment. ‘Green Works Care™ for peonies’ even has big advantages over the traditional water treatment.

The benefits of Green Works Care™ are:

  • Plants do not dry out when using the Green Works Care™ treatment
  • The Green Works Care™ treatment is environmentally friendly and sustainable
  • Special preventive treatment against root-knot and leaf nematodes
  • The plant has much more vigor in the first year
  • In the second year an addition revenue of stems per plant
  • No chemicals throughout the entire process
  • Thus no chance of resistance to chemicals
  • The treatment is safe and presents no risks to people, animals and environment

Peonies after receipt; save/store by the grower

Planting peonies is best done in the fall. In cool periods (fall) the plant roots more and that causes the plant to make more foliage in the spring. Therefore try to plant the peonies before the first frost. Peonies you plant in the fall should not be cooled during storage.

When the cooling period is too long, the plant will still sprout before winter. With the result that the crop sprouts in the winter or early spring and still suffers frost damage.

Click here for more information.

New planting


  • Soil sample: determine main, trace elements and organic matter content. Also take a nematode sample
  • Add compost if necessary
  • Very good drainage of soil
  • Free of root weeds
  • Good soil structure
  • Pre-fruit in connection with nematode infection
  • Spray dead in time
  • For orientation go to the auction and visit the fields where peonies are grown for the roots (purchase for a longer time)

Click here for all information regarding New planting.

When planting peonies in fall 2021; benefits of 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

In the following link you will find our extensive and updated peony assortment of 2021 – 2022:

Peony Catalog 2021 - 2022

Green Works also supplies other summer flower starting material, like: Ranunculus Butterfly™, Ranunculus Romance™, Scilla peruviana and Asclepias Beatrix®.

Also, follow Green Works on TwitterFacebookInstagram and LinkedIn for more relevant information about Helleborus or. Queens™ amongst other things.

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

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