The very large green vegetables in the teahouse are called choy sum. Tea house long strip of green vegetables are lettuce, oleander, leeks, coriander, cabbage, garlic shoots, scallions, parsley, celery, capers, cabbage, choy sum, etc., which is very large is choy sum. Vegetable heart, also known as vegetable shoots, is one of the specialty vegetables in the south of China. The root system is shallow, and the stem is shortened and green before drawing, the leaf width is ovoid or oval, the leaf margin is undulate, the leaf blade is green or yellow-green, and the petiole is light green.