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Walnuts (Persian walnut, black walnut, white walnut) Walnut trees growing in the wild reach a height of up to several tens of meters. However, fruit varieties are significantly lower. Persian walnuts propagated by grafting (Juglans regia) enter the fruit-bearing cycle early and produce larger nuts with thinner shells. Vegetation starts late and the plant blooms in the middle of May. Polish selections of varieties show full resistance to low winter temperatures. Unlike the majority of fruits, walnut kernels are low in water content and high in fat and protein content. They are high in vitamins of the groups B,C. Walnut trees prefer warm areas free from frost. The plants prefer fertile and permeable soils rich in calcium content. Walnuts are one of the most difficult varieties to propagate (by vegetation methods). Black walnut (Juglans nigra) is a North American variety growing into a large tree (up to 35 m tall). Crowns are spherical and wide. Leaves are large, up to 60 cm long. Nuts are hard. White walnut (Juglans cinerea) is a variety stemming from Northern America. It grows up to over 20 meters. The plant forms wide crowns. Leaves are large (up to 70 cm long), nuts are elongated, shells are hard, edible, their taste is sweet and buttery. Interesting facts: historically, propellers of planes were made of nut wood. Nut kernels have more calories than beef.