Helleborus Queens growing advice April 2016 (spring / summer)
Dear Helleborus Queens® grower,
Helleborus orientalis have two growing periods in a year. The first one starts in April. During this period the plant grows and develops new leaves. The second period occurs around the end of August. The plant experiences a strong root growth and is building up reserves that are needed to develop the flower buds. In the growing period Helleborus Queens uses a lot of water. This is because their large leaves evaporate much and beacause of the strong growing power. It is important that the plants are able to take the water needed for evaporation. If this is not the case the leaves will die too soon and it will be at the expense of the flower buds in the following season.
Continue watering as long as the leaves are growing. Make sure to let the plants dry after watering because of potential problems with mildew.
From around mid-June start watering 1/3 less (But keep an eye on the development of the crop).
Control in spring with nitrogen. Therefore take regularly a soil sample.
At the growth of new leaves start with spraying multiple times against botrytis. Loss of leaves due to botrytis = loss of stems during the next harvest.
Botrytis can be controlled with Luna, Switch, Kenbyo, Teldor, or Rovral (means that leave no residue).
From the end of April we advice to protect the leaves with shades and/or chalking the greenhouse. When the leaves come out of these months in a good shape, it will benefit the flower quality and quantity. Full grown Helleborus Queens can endure high temperatures in the summer months very well, provided the humidity is high enough.
Mildew is a disease that, in our experience, can cause the most damage. To prevent the plants from getting this disease it is important to spray in the months April till October on a regular basis. Strongly affected plants should always be removed to prevent spreading. Air circulation in the greenhouse is important. Draft needs to be prevented at all times, strong wind helps the disease to spread rapidly. Check out the Mildew spray Ortiva + Ridomil Gold.
Aphids can cause damage throughout the whole year. Therefore a good scouting in all areas of the parcel is important.
Control the aphids with Admire or Confidor (also works at low temperatures!).
Spidermite can cause problems in the warm summer months. Control with Scelta or Floramite.
Caterpillars and snails can cause damage above as well as underground. Control with Turex or Decis.
In the extended cultural information PDF we talk in depth about the following subject:
- Planting time and first growing season
- Growing periods and leaf cutting
- The harvesting of flowers
- Plant protection
- The soil
Click on the button below to view the extended cultivar information PDF for the Helleborus Queens®:
Extended cultural information PDF
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