Note to the gardener: how to propagate currants from cuttings

Currants are a very valuable berry due to their high content of various microelements and vitamins. She is not too whimsical in her care, and there is nothing difficult in her reproduction either. Usually, vegetative methods are used to propagate currants: dividing the bush, cuttings, layering.
We will talk about how to propagate currants from cuttings. To do this in the spring (March-April), when the buds swell on the currant bush, you need to cut cuttings from 11 cm to 14 cm long, making the upper cut at a right angle 0.5 - 1 cm above the bud, and the lower one just below it. Leaving the top two buds on each cutting, remove the rest and immediately place the cuttings in glass jars with water. To prevent cuttings from oppressing each other, there should be no more than 5 of them in each container.
If we want to successfully propagate currants by cuttings, then the best place for jars with shoots is a window sill on the north side of the house. In such conditions, after 10-12 days the cuttings produce roots. When the largest of them reaches 10-15 mm, you need to plant the cuttings in separate containers (cups) with a soil mixture, for the preparation of which you should take 3 parts of peat, one part of humus soil and one part of sand. You need to put nitrophoska (5 granules) on top of the soil in each cup.
After transplantation, the seedlings need to be watered abundantly in the first few days. After a month they will be available plant in open ground, but about a week before this, they should be “hardened” by placing the cups on an open sunny balcony. In the first days of such preparation for planting in open ground, they should be protected from direct sunlight. Practice shows that seedlings obtained in this way, by the time they are planted, are on average 25 cm ahead in growth of seedlings obtained by rooting in the soil in the fall of the previous year.
Comments
Tell me, after planting, how to prepare them for winter so that they can survive the first winter without loss?
For some reason I couldn’t propagate from cuttings, although I seemed to do everything correctly. But it was possible to bury a branch from a bush twice. Now two bushes are growing, even in the second year they produced several berries.