If you want to harvest large and sweet fruits at the end of the season, you need to feed the grapes in the last month of summer.
However, fertilizers applied in August affect the formation of the vine, help the berries ripen faster, and also help the plant survive the winter more easily.
During this period, gardeners recommend adding phosphorus-potassium fertilizers.
In this case, feeding can be foliar or root.
You can consider wood ash for this purpose.
It is better to apply it in dry form directly under the root in August, and then lightly dig it in.
At the end of the procedure, the soil should be moistened so that the ash penetrates better into the soil.
Foliar feeding can be made from superphosphate. 1 kilogram of the product should be poured with 2 liters of boiling water. The solution should be infused for a day.
After this, each glass of this mixture must be diluted with another 10 liters of clean water.
Then you can proceed to spraying the plant.