The walnut tree can grow up to 25 m high, the 40 cm long, green, glossy leaves are pinnate. Flowering time is April/May, the fruit, the walnut is a spherical drupe with dark brown discoloring fleshy shell with hard nutshell when ripe.
Phytotherapeutic uses are the dried leaves (walnut leaves - Juglandis folium).
Studies indicate antiproliferative activity of proteins and protein hydrolysates contained in walnut: walnut protein hydrolysates showed antiproliferative effect on breast cancer, colon cancer cell lines, carcinoma cells of prostate and also leukemia, as well as melanoma cells.