70D Improved Green Yu Choy Sum


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70D Improved Yu Choy Sum is an easy-to-grow leafy vegetable commonly used in Chinese cuisine! It has dark green oval shaped leaves on shiny green stalks and bright yellow flowers that are just as sweet and fresh as the stalk, which is a thinner stem than Chinese Broccoli. This southern Chinese staple known as "Choy Sum" is Cantonese Chinese for "heart of the vegetable" and is a favorite in dishes because of its tender stalks and flowers, delicate leaves, and crunchy sweet taste.  70D Improved Yu Choy Sum can grow 7" - 14" plants with thick petioles and is improved to have excellent eating quality, and good heat-tolerance and disease resistance, making it ideal for Spring through Fall planting! Yu Choy Sum is full of phytonutrients and vitamin C making it a healthy addition to any meal.

Also Known As: Hongcai Tai, 红菜苔, Hongshan Caitai, Cai-Tai, Green Yu Choy Sam, Green Cabbage Moss, October Moss, Autumn Moss, Hubei Moss, Wuhan Moss, Seaweed Moss, Chinese Cabbage Choi, Cantonese Yu Choy Sum, Kosaitai, Chinese Yellow Flowering Cabbage, Flowering Bok Choy, Cai Xin, Sawi Bunga

We ship in 1 business day. Shipped with USPS First Class Mail.

Plant Name:
Yu Choy, Green 70D Improved
Latin Name:
Brassica rapa subsp. chinensis
Days to Germinate: 6-10
Days to Harvest: 35
Germination Rate: 95%
Test Date: 10/23
Growth Habit: Upright
USDA Zones: 3-12
Lifespan: Annual
Brand: TomorrowSeeds
Sunlight: Full Sun, Partial Shade
Heirloom, Open-Pollinated
Fungicide-Treated Seeds*: No
Seeds Packed For**: 2024

*Fungicide-treated seeds protect the seedlings from diseases until they are up and growing. Do not eat treated seeds.
**Seeds are freshly packed for the growing season of the year listed. Seeds are still viable beyond pack date. Store in a cool and dry location such as the refrigerator or basement to best preserve germination rates.

Planting Instructions:


Soil Preparation:

Remove weeds, large rocks, and litter from the planting area. Till the soil 8-10 inches deep and rake several times to break up large clods. It is best to do this when the soil is dry enough to not stick to garden tools. Loosening the soil will help the plant establish strong roots.


Yu choy sum is a cool-season crop and does well in the cool temperatures of Spring and Fall. Soil temperature should be at least 50F for seeds to sprout; exposure below 50F may result in bolting. Use a hoe handle or stick to make a 1/4 inch furrow deep down the center of the ridge.  Plant 1-2 seeds in the furrows spaced 8 - 12 inches apart within the rows. Cover lightly with loose soil then sprinkle with water.


Planting Depth: 1/4 inch
Within-Row Spacing:
8 - 12 inches
Between-Row Spacing:
1 - 3 feet


Care During the Season:

Watering: Water plants moderately. If the soil moisture is low, water but avoid waterlogging soil. Try to avoid wetting foliage to prevent diseases.

Weeding: Keep plants free of weeds, which rob weak root systems of nutrients and moisture.

Insecticides: Insecticides may be used to protect plants. Bt-based insecticides and sulfur are organic options that can be used for prevention. Sevin is a synthetic option. Sulfur also has fungicidal properties and helps in controlling many diseases. Before using a pesticide, please read the label and always follow cautions, warnings and directions.

Diseases: Disease can happen in cloudy, damp weather. Check plants daily and treat with an approved fungicide if diseases do appear. Neem oil, sulfur, and other fungicides are available for use. Please always follow label directions.


Yu Choy Sum can be harvested at any stage of maturity. Fully mature yu choy sum leaves may be harvested 30 - 40 days after sowing when the flower buds are fully developed but not open. Harvest the leaves, flower buds, and stems are together by cutting the stalk at the base of the soil level. Harvest regularly for continuous growth. Two-to-three harvests are possible for each season of growth.


Nutrition Facts:

Calories 48
% Daily Value*
Total Fat 0.3 g 0%
Saturated fat 0 g 0%
Polyunsaturated fat 0 g
Monounsaturated fat 0 g
Cholesterol 0 mg 0%
Sodium 13 mg 0%
Potassium 340 mg 3%
Total Carbohydrate 0.8 g 0%
Dietary fiber 2.8 g 11%
Sugar 0.8 g
Protein 1.3 g 3%
Vitamin A 29% Vitamin C 52%
Calcium 6% Iron 10%
Vitamin D 0% Vitamin B-6 5%
Cobalamin 0% Magnesium 3%
*Percent Daily Values are based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.