Kale (scientific name: Brassica oleracea var. acephala DC.) is a biennial herbaceous flower of the Brassicaceae family and the Brassica genus. Kale leaves are wide and spoon shaped, with smooth and hairless leaves and fine wavy folds at the edges; The petiole is thick and winged; In April, it will sprout and bloom, with colors ranging from golden yellow to orange yellow; Long horned fruit cylindrical; The seeds are spherical in shape and gray brown in color. The observation period is from December to March of the following year. In Wu Wei's book "Cultivation Techniques for Protected Special Vegetables," it is written: "The whole plant of kale is shaped like a peony, so people also call it leaf peony