For (garlic, leeks)
The edible part of the leeks is elongated onion with thickened ones, whitened leaf sheaths that make up the pseudo-stem. Unlike onions or shallots, the leeks are planted quite deep and covered as the plants grow, to get the longest bleached part possible.
Summer varieties are known, autumn and winter; summer and autumn grow quickly and give high yields, but are sensitive to low temperature. In Poland, from the early varieties, the 'Titan' variety is recommended, among medium late - 'Słoń' and late - 'Karantański'. Leek tolerates stronger fertilization than onions, including liquid organic fertilizers. Recently, leek is grown more and more often from sowing directly into the ground. The seeds are sown in April, in spacing 30 x 15—20 cm. The seedlings are generally produced in the greenhouse or in the inspection. The seeds are sown in early March, plants a seedling into the ground in May, in spacing 40 x 20 cm. A well-developed seedling is planted to the depth of the hole 20 cm and watered abundantly. Before planting, neither the leaves nor the roots are shortened. After loosening the soil or after heavy rain, it is advisable to sprinkle the plants lightly. Summer and autumn varieties must be dug out of the ground before frosts and stored in damp sand in the cellar. It is not necessary for winter varieties, because they keep well under the layer of snow. They can only be damaged by severe frost in the absence of snow. They are dug out of the soil in early spring.
Diseases and pests of onion vegetables
Bulb plants are quite resistant to diseases and pests, however, the strings committed in the cultivation favor their occurrence. Infection by downy mildew can be prevented by frequent spraying with horsetail preparation. The onion cream attacks plants that grow in shaded places and close to the roots of trees, therefore such places in the cultivation of onions should be avoided. Coordinate cultivation with carrots is preferable, as well as dusting plants with rock meal or spraying Pyrethrum”. Similar measures are used against onion violin, which damages onion leaves. Damaged leaves discolor and break easily. The chanterelle larvae can also be destroyed by crushing them, and damaged leaves are best removed, because new ones will grow up quickly.