Growing grapes in the northern regions seems impossible only at first glance. With proper preparation for winter, even heat-loving varieties can withstand extreme frosts down to -40°C. The secret of success lies in reliable insulation, which protects not only from cold, but also from temperature changes.
Polystyrene foam creates an air layer and does not let in the cold from the frozen ground. Additional shelter maintains a stable temperature around the vine, preventing the buds from freezing. This method is especially effective during snowless winters.
Step by step instructions:
Preparing the vine
After the first frost, unripe shoots are pruned. The vine is carefully removed from the trellis, tied into bunches and treated with a 3% solution of copper sulfate.
Base insulation
Sheets of polystyrene foam 5-10 cm thick are laid on the ground. A vine is placed on top, trying not to damage the buds.
Multi-layer shelter
First layer: spunbond or agrofibre
Second layer: plastic film with holes for ventilation
Third layer: spruce branches or dry leaves
Fixation
The structure is pressed down with boards or bricks to prevent the shelter from being blown away by the wind.
Important details:
- Work is carried out on a dry day at temperatures down to -5°C;
- In spring, the cover is removed gradually, layer by layer;
- For humid regions, be sure to leave air vents;
- Young bushes are additionally covered with earth.
With such shelter, the grapes retain up to 95% of living buds. In spring, the vine quickly begins to grow, and the first clusters ripen in August.
