How can winter cut rose flowers be grown for high yield?

Winter is a season with a relatively large gap in the supply of cut rose flowers, especially in northern regions. There are fewer rose flowers, and the price of cut flowers also rises. So how can winter cut rose flowers be grown for high yield? What techniques are there for cultivating rose flowers in winter? Below, Huacaole shares with you:

1. Do a good job of heat preservation measures, and increase the greenhouse room temperature and ground temperature

A reasonable greenhouse structure should be used to ensure that the greenhouse can absorb sunlight energy to the greatest extent and increase the indoor temperature, so that the daytime room temperature stays at around 25°C, and must not exceed 28°C at the highest; use cattail mats, straw mats, thermal insulation quilts or paper quilts to cover the greenhouse and reduce heat consumption. Finally, heating measures should be taken, and cold-proof trenches should be dug. The trenches should be filled with organic matter such as wheat straw and rice straw, with soil covering the top, to increase the nighttime temperature of the greenhouse. The nighttime temperature should be around 15 degrees in order to maintain normal cut rose flower production.

2. Increase light to promote rose growth

In winter, the light intensity in northern regions is weak, and roses are also light-loving plants. Therefore, every possible means should be used to increase light and promote rose growth. First, choose drip-free film with good light transmittance, and keep the greenhouse film clean to help enhance light transmittance. Second, use reflective film, laid on the ground between ridges or attached to the back wall of the greenhouse, to increase light intensity. Third, use artificial light sources to supplement the insufficient light in winter.

3. Fertilization and appropriate watering

 Generally, fertilize once every 2 to 3 weeks, and organic fertilizer and chemical fertilizer should be used alternately. Because the winter temperature is low, and because there is plastic film covering, evaporation and transpiration are reduced, while cut rose flowers require the relative humidity in the greenhouse to remain between 65% and 70%, so the number of waterings should be appropriately reduced. Generally, watering is done together with fertilization.

4. Bending branches combined with pruning

Bending weak branches and blind branches can reduce nutrient consumption, increase the accumulation of organic matter, and maintain stable yield and quality of cut rose flowers. A one-time pruning method can also be used to increase the number of cut rose flowers in a certain flush, with priority given to ensuring the supply of cut flowers before holidays.

5. Pest and disease control

The main pests and diseases of winter cut rose flowers are powdery mildew, aphids, whiteflies and red spider mites, etc. 1) For the control method of powdery mildew, during the disease period spray a 1000—2000 times dilution of triadimefon solution or a 70% thiophanate-methyl 1000—1500 times solution. Check frequently, and immediately prune and burn diseased branches and leaves when found. Control watering, apply less nitrogen fertilizer, prune carefully, and make the inner canopy of the crown well ventilated and well lit.