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The Choy sum (Brassica rapa var. utilis) belongs to Brassiaceae (the Mustard family). It is a biennial herb that is native to Europe, it became widespread in China during the Tang Dynasty (618-907) and is now considered one of China's vegetables. It is primarily produced in Guangdong Province. It prefers a warm climate and grows to a height of 40-50 cm. The main varieties include "Chinese choy sum" (early variety), which was originally brought from China, and "Guangdong choy sum", which is a modified version of the original. Both varieties grow relatively quickly and can be harvested approximately 40-60 days after sowing. The main harvest period is from early summer to fall. The leaves have a slightly grassy smell when raw, and the buds are also bitter, so they are not suitable for salads. However, they have a mild
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