Grapes are unusual enough in cold climates. Therefore, it is especially important to preserve the seedlings in the winter. There are special rules, the implementation of which will help the berry to successfully overwinter.
To ensure your plants survive the winter successfully, try to get healthy, quality seedlings. They must be labeled with the name of the rootstock and the variety. Make sure that the seedling has three strong roots that are more than seven centimeters long. They should grow from different sides of the rootstock.
On an annual vine, the rootstock length from base to scion should be 30-35 centimeters. Examine the vaccination site carefully, a good sign is that there are no cracks. The rootstock and scion must be free of visible signs of disease. Black or dark brown spots on wood that are from one millimeter to three centimeters long indicate the presence of diseases.
The most important thing in storing seedlings purchased in the spring is to try to prevent them from drying out. It is advisable to place the plants vertically in the open air, bury them to the grafting site with damp sand or earth. The seedlings purchased in September or October are stored differently. They should not dry out, germinate and freeze.
Pre-spray all the cuttings of the seedlings with a solution of potassium permanganate, this will protect the plants from such a dangerous disease as oidium. Then place the cuttings in any container with slightly damp sand. Tie the seedlings in bunches and put them in bags with wet sawdust.
Now you need to equip a basement or cellar for storing grapes, it should not be too humid. A cellar is only suitable for one with no groundwater next to it. The depth of the room you choose should be at least two meters. Try to keep the temperature zero to five degrees above zero.
Cover the floor with a layer of sand 10-15 centimeters thick and 10% moisture. Place the seedlings and lightly bury with sand, the grafting site should be open. Keep an eye on the moisture content of the sand; if necessary, moisten it with water from a sprayer. If you do not have a cellar or basement, bury the cuttings 1.5 meters deep in open ground. Insulate the top with humus, peat or sawdust.