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There is a vegetable called choy sum is what vegetable

Chaosin, also known as cabbage shoots, is Brass shoots genus, one- and two-year-old herbs .

Cabbage shoots for the genus Rutabaga species of cabbage subspecies in the flower shoots for the product varieties. The root system is shallow, the stem shortened before drawing, green, leaf width ovoid or elliptic, leaf margin undulate, leaf blade green or yellow-green; petiole light green. Drawing flower stem cross section rounded, yellow-green or green, flower stem leaves smaller, ovoid, flower stem leaves petiole short in the lower part of the flower stem, the upper part of the flower stem leaves petioles.

Root System Characteristics

Shallow root system, many fibrous roots, strong regeneration ability.

Stem characteristics

Shortened and green before shooting. Flowering shoots rounded, yellow-green or green.

Leaf Characteristics

Broadly ovoid or elliptic, green or yellowish-green, leaf margins undulate, with lobes or absent at the base, or with wings extended, and veins conspicuous. Petiole narrow, shallowly fluted, semilunar in cross section, light green. The leaf blades on the flowering stems are smaller, ovate or lanceolate, with short petioles in the lower part and no petioles in the upper part.

Flower characteristics

Racemes, fully flowered, branched. Corolla yellow. Stamens are tetradynamous, pistils are synandrous. Superior ovary, lateral membranous placentation.

Fruit characteristics

Long-horned fruit, two-celled, yellow-brown at maturity. Seeds suborbicular, brown or dark brown, tiny, 1.3 to 1.7 g per thousand.

Growing conditions

Cabbage hearts like mild climate, wide adaptability, photoperiod requirements are not strict, can be cultivated annually, suitable for organic matter, drainage and irrigation convenient sandy loam or loam cultivation. The temperature is too high or too low, will lead to vegetable shoots slender, low yield, poor quality.

The appropriate temperature for the growth and development of vegetable shoots is 15 to 25℃. Different growth period of different temperature requirements, seed germination and seedling growth temperature for 25 to 30 ℃; leaf growth period requires a slightly lower temperature, temperature for 15 to 20 ℃, 15 ℃ below the slow growth, 30 ℃ above the growth of more difficult. Vegetable shoots formation period for 15 to 20 ℃, in the day temperature of 20 ℃, the night temperature of 15 ℃, vegetable shoots develop well, about 20 to 30 days to form a good quality, high yield of vegetable shoots; in 20 to 25 ℃, vegetable shoots develop faster, only 10 to 15 days to harvest, but vegetable shoots are small, poor quality. The quality of vegetable shoots developed above 25 ℃ is even worse.