Pioenen verzorging juni 2015 Green Works

Peony care newsletter, June 2015

Peony growth not done after harvest of flowers!

Herewith we send you our Peony Newsletter 2015. Information currently relevant to the crop of peonies needs special attention. We trust that this information will be helpful in achieving a successful crop. For questions or remarks please feel free to contact us.

Botrytis control

Control of botrytis in peonies is a long term battle. Especially not taking care of botrytis damage after the flowers have been cut is an important measure to prevent many problems. Make sure to spray against Botrytis after the flowers have been cut to prevent further infection. Add Magnesium (bitter salt) to the Botrytis spray to harden off the plants.
In the fall the fungus will form winter spores which will winter over in the soil/air. This is also the spot where the infestation starts in the spring. Thus control is needed in the spring, but the basis lies in  the late-summer. The now much used Collis in the spring is absolutely not a total solution but a part of the solution. Research has shown that cutting the plants not too short (+/- 10 cm above the soil) in the fall, has a Botrytis preventive effect and thus will decrease the chance of falling over(Botrytis damage) of the stems the following spring.


Leaf nematodes in weeds can infect a parcel. 
It is important to totally control weeds during the summer. Round-up control of street grass, this weed control cannot be used in peonies. This product is taken up by the plant through the roots. Roots will make contact with the Peony roots and therefore make damage. For a weed infected parcel the only product left is Basta. It is possible to add some ureum. If a lot of street grass is present it is useful to add a small quantity of Chloorprofam to the Basta.

Leaf spot diseases

Leaf spot diseases are causing more and more problems in the growth of peonies. Leaf spots fungus and Botrytis ssp cause different kinds of leaf spots in the peony, see pictures below. Both fungus spread well during warm and humid conditions. Both fungus survive on plant rests. 

Damage in PeonyExample of leafspot damage in Peony
(Picture PPO)





Left Botrytis and right leaf spot damageLeft Botrytis and right leaf spot damage
(Picture PPO)





Leaf spots are distinguished from botrytis very well, here the symptoms:


  • Botrytis causes a light brown spots whereby the whole or halve leaf is affected quickly
  • The affection is often at the ends of the leaves
  • Develops from above
  • During humid circumstances you will find a gray mould on the affected leaf

Leaf spots:

  • Spots spread over the whole leaf
  • The spots start as light red/purple red specks
  • Later these specks will develop into purple brown patches


  • Use healthy starting material
  • After mowing discard the plants rests from field
  • Water in the morning so that the plants will not be moist during the night
  • Spray preventively with Daconil, Flint, Ortiva or Switch. Change regularly between these means to prevent resistance

New planting of peonies


  • Take a soil sample and nematodes sample 
  • Very good drainage system 
  • Free of root weeds 
  • Good soil structure 
  • Check the crop before planting Peonies with reference to nematodes infection of previous crop
  • Spray on time on the field to make free of weeds
  • For orientation visit the auction and our fields where peonies are grown for resale (long term purchase)

Planting time

  • Set up a planting scheme 
  • Outside: September March (fall is best time period) 
  • Put head/eyes of Peonies straight up 
  • Preparation of the soil is very important with regard to structure/water drainage 
  • Drainage of the parcel 
  • Plant in moist soil 
  • Take the spraying and harvest of the flowers into account with layout of field
  • Keep into account the possibility of using plastic tunnels in the future (spreading of crop/more yield). 

Planting depth

  • Planting depth +/- 5 cm soil on top of the roots (if planted too deep less flowers).


After flowering fertilization needs to be aimed on the vegetative growth of the plant, the leaves need to grow and fully mature. The leaves that are forming the plants now will be the basis of the flower production the following year.
The formation of the flowers will be in July and August. Take soil samples/leave samples regularly and in fixed time periods, so that you will get a better view of the needs of the plant.

Normal applications of fertilization kg/ha for peonies on a year basis:
(at normal soil values)

  • N-needs, 150 kg/ha
  • Phosphate, kg P2O5, 100 kg/ha
  • Kali, kg K2O, 225 kg/ha
  • Magnesium, kg MgO, 100 kg/ha

After flowering, fertilize for flower bud formation next season.

  • Calcium apply halve (a.o. Patentkali)
  • Nitrogen minimal 50 kg
  • Magnesium (bitter salt)

Be alert that enough water will be available for the plant to take up the fertilizers. Drought in this period will damage the flower harvest for the next year.
DCMAn active soil life is very important; moist soil and a correct organic matter level are very important to improve the taking of the above mentioned fertilizers. (More information: www.dcm-info.nl)

Organic fertilizers after the flowering!
After flowering you can apply fertilizers in different ways. DCM offers slow releasing organic fertilizers that fit in perfectly in the peony growth. Especially after flowering there is a strong need for Nitrogen and Potassium (K) for the production and formation of the plant for next growing season! This way the peonies will produce maximal stems every year. You can achieve this in different ways. You can choose for a combined organic fertilizer like DCM Mix 6 (6-3-18+3MgO) or apply the elements separate from each other.

When applying separately the combination of Vivikali with a regular Nitrogen fertilizer is well known. The advantage of Vivikali with regard to for instance patent Potassium is the much lower level of salt in this fertilizer. This means that this fertilizer is much milder for the roots.

Especially in periods of extreme drought this is very important. Moreover Vivikali contains trace elements, hormones and improves the soil life. Dosage of Vivikali is normally between 400 and 600 kg per ha. Because of the drought the taking of elements is not always optimal. A leaf fertilizer is a good option to keep the plant in a healthy condition. DCM has 2 leaf fertilizers which are fast releasers. You can also combine these leaf fertilizers.

  1. Olega FerOlega complex broad working leaf nutrient (contains all main- and trace elements, sea weed extract and ureum)
  2. Olega fer fast releasing iron leaf nutrient which is very mild for the plant (contains sea weed extract and ureum)

For dosage and application information in combination with plant protection products you can contact DCM, more information: www.dcm-info.nl

Planting material

In order to deliver a superior quality of plant material our plants meet the following requirements: 

  • Young and healthy plant material (Two year crop)  
  • True to variety 
  • Free of nematodes 
  • Free of invasive weeds 
  • Dutch grown and NAKT (Dutch Plant Inspection) inspected 
  • Well-sized, on average we deliver: 2-3 eyes (75 roots per lily crate)
    and 3-5 eyes (50 roots per lily crate) 
  • For customers professional photography available 

Green Works also supplies young planting material for summer cut flowers like the: Asclepias Beatrix®, Veronica Christa®, Zantedeschia aehiopica White Swan® and the Campanula s. Royal Wedding®.

Sales & Growing Support

If interested or if there are any questions and/or remarks, please contact: 

Peony Assortment 2015 - 2016

Check out the Peony assortment 2015 - 2016

Catalog 2015Peony Catalog 2015











Green Works International can never be held liable for any cultural information given and only to be used as a guideline. Grower is at all times responsible for their own action and to read the label of the chemicals being used.