Yu Choy
A popular Chinese flowering vegetable with tender stems and small yellow flowers that are all edible.
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Meet Yu Choy
A popular Chinese flowering vegetable with tender stems and small yellow flowers that are all edible. The flavor is mild and slightly sweet, similar to choy sum, and excellent stir-fried with garlic and oyster sauce. Plants bolt quickly in warm weather, so time plantings for cool spring and fall seasons. Harvest when flower buds are just beginning to show but before they fully open for the best flavor.
When to plant Yu Choy
Direct sow is preferred as yu choy dislikes root disturbance. Sow seeds one-quarter inch deep once soil temperatures reach 50 degrees Fahrenheit. Thin seedlings to 6 to 8 inches apart. For early starts, sow in cell trays 3 to 4 weeks before last frost and transplant carefully. Germination takes 4 to 7 days. Begin succession planting every 2 to 3 weeks for continuous harvest.
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Used once to set your season · never sharedHow to grow Yu Choy
Yu choy, also known as choy sum or flowering Chinese cabbage, is a quick-growing green prized for its tender flowering stems and mild, sweet flavor. Direct sow seeds one-quarter inch deep from spring through fall, spacing 6 to 8 inches apart in rows 12 to 18 inches apart. Seeds germinate in 4 to 7 days at 55 to 75 degrees Fahrenheit.
Yu choy prefers cool to mild weather and can bolt quickly in temperatures above 80 degrees Fahrenheit. Provide consistent moisture and partial shade during warm weather. Succession sow every 2 to 3 weeks for continuous harvests of tender flowering stems throughout the growing season.
Fertilize with nitrogen-rich liquid feed every 2 weeks to promote rapid, succulent growth. Harvest entire stems with flowers when blooms are just opening or still in bud. Cut stems 6 to 8 inches long just above the base to encourage regrowth. Yu choy is excellent for container growing and matures in just 35 to 50 days from sowing.
The bed planner spaces every plant for you
Pick a bed size and PlotMyGarden spaces your Yu Choy at 20 cm, counts how many fit, and lays the block out before you buy a single seed.
Yu Choy's best neighbours
Yu choy grows well alongside other Asian greens, lettuce, and herbs like cilantro. Radishes help deter flea beetles when interplanted. Taller plants provide beneficial shade in warm weather. Avoid planting near other brassicas to reduce shared pest problems. Sweet alyssum planted nearby attracts beneficial insects.
It flags clashes before you plant, not after
Every plant you place is checked against its neighbours in real time. Good matches glow green; conflicts get flagged on the spot — so a season-wrecking mistake never makes it into the ground.
Feed it well
Yu choy grows best in fertile, well-drained soil with a pH between 6.0 and 7.0. Amend with compost before planting. Apply nitrogen-rich liquid fertilizer every 2 weeks for rapid, tender growth. Avoid heavy fertilization which can make stems tough and promote excessive leaf growth over flowering stem production. Keep soil evenly moist throughout the growing season.
Ideal Temperature
Hardiness Zone Compatibility
From seed to harvest, stage by stage
Seed Germination
Tiny round seeds germinate rapidly in cool, moist soil, often sprouting within 3-5 days. Rounded cotyledon leaves emerge first, pale green and fleshy. Yu choy seeds are very small — roughly 300-350 seeds per gram — so sowing evenly requires a light touch or mixing with sand.
Seedling Development
True leaves develop rapidly, showing the characteristic smooth, rounded brassica leaf shape with a slight waxy sheen. Stems begin to thicken and the root system establishes quickly in loose, fertile soil. Seedlings grow vigorously in cool weather and can handle light frosts.
Vegetative Growth
Plants grow rapidly, developing thick succulent stems and broad dark green leaves. The central stalk thickens to pencil width or larger. Side shoots begin to emerge from leaf axils, creating a bushy structure. This is the phase of maximum leaf and stem production.
Bud Formation
Small green flower buds form in tight clusters at the stem tips. This is the prime harvest window — stems are at peak tenderness and sweetness just as buds appear but before flowers open. The plant begins elongating its central stem as it transitions to flowering.
Flowering and Continued Harvest
Bright yellow four-petaled flowers open on elongated stems. The flowers themselves are edible and mildly sweet. Side shoots continue to produce new buds and stems for successive harvests. Plants in cool weather can produce harvestable side shoots for 3-5 weeks after the initial cut.
Seed Set and Decline
Flowers mature into slender seed pods (siliques) as the plant completes its life cycle. Stems become increasingly woody and fibrous. Flavor turns bitter as the plant directs energy toward seed production. Allow a few plants to set seed for saving if desired.
Sow seeds 0.5-1 cm deep in moist soil and keep consistently damp until germination. Avoid burying seeds too deeply as they need light to trigger sprouting. Soil temperature of 15-20°C (59-68°F) is ideal for fast, uniform germination.
Caring for Yu Choy month by month
What to do each month for your Yu Choy
July
You are hereRest month for yu choy in most climates. Begin planning autumn sowings. In mountain or coastal regions with cool summers, successive sowings can continue year-round.
Harvesting Yu Choy
Harvest yu choy when flowering stems are 6 to 8 inches long and yellow flower buds are just beginning to open. Cut stems at a 45-degree angle 2 inches above the soil to encourage side shoot production. The entire stem including leaves, buds, and open flowers is edible. Harvest every 2 to 3 days during peak production. Morning harvest ensures maximum crispness and sweetness.
We count the days and tell you when to pick
Tell us when you planted and PlotMyGarden tracks the 45-day countdown to harvest, then pings you the day your Yu Choy is ready.
Storage & Preservation
Fresh yu choy stores for 3 to 5 days in the refrigerator wrapped in a damp paper towel inside a plastic bag. It is best used fresh as the delicate stems wilt quickly. For freezing, blanch whole stems for 1 to 2 minutes, ice-bath, and freeze flat in bags. Yu choy can also be pickled briefly in a light rice vinegar brine.
What goes wrong — and the fix
Aphids
PestClusters of small insects on young stems and flower buds, causing distorted growth.
Flea Beetles
PestSmall round holes in leaves, heaviest on young seedlings and in warm dry weather.
Downy Mildew
DiseaseYellow spots on upper leaf surfaces with grayish mold on the undersides.
Troubleshooting Common Problems
Premature bolting in hot weather is the primary challenge, producing tough, bitter stems. Inconsistent watering causes woody stem texture. Flea beetles can damage young seedlings heavily before establishment. Overcrowding leads to thin, weak stems. Old, overmature plants produce tough, fibrous stems with strong flavor.
Growing Tips
- Succession sow every 2-3 weeks from early spring through autumn for a continuous supply. Yu choy matures so quickly (35-50 days) that you can fit 4-6 plantings into a single growing season, maximizing your harvest from minimal garden space.
- Harvest at the bud stage for peak flavor and tenderness — cut the main stem about 15-20 cm from the top just above a leaf node when small green flower buds have formed but before they open. This timing gives the best balance of sweetness and crunch.
- Always cut above a leaf node to encourage regrowth. After the initial main stem harvest, side shoots will emerge from the remaining leaf axils and produce 2-3 additional harvests over the following 3-5 weeks.
- Do not grow yu choy in hot weather. Temperatures above 25°C (77°F) cause immediate bolting, tough stems, and bitter flavor. In warm climates, plant only in spring, autumn, and winter — skip the summer months entirely.
- Flea beetles are the primary pest of yu choy and can riddle seedling leaves with tiny holes. Cover newly sown beds with fine insect mesh (0.8mm) immediately after planting and leave it in place until plants are well established.
- Space plants 10-15 cm apart for full-sized stems, or sow densely at 5 cm spacing and harvest as baby greens at 20-25 days for tender salad leaves. Dense sowing also suppresses weeds and makes efficient use of small garden beds.
- Water consistently and evenly — drought stress causes premature bolting and bitter, fibrous stems. Yu choy has shallow roots and needs 2-3 cm of water per week. Mulch with straw or grass clippings to retain soil moisture in warmer weather.
- Rotate yu choy with non-brassica crops each season to prevent clubroot and other soil-borne diseases common to the cabbage family. Avoid planting where any brassica (cabbage, broccoli, bok choy, kale) has grown in the previous 2-3 years.
Pick your Yu Choy
Yu Choy Sum
The standard variety with green stems and yellow flowers, producing abundant tender shoots.
Hon Tsai Tai
A purple-stemmed variety with striking color and slightly sweeter flavor, very cold-hardy.
Green Fortune
A compact, quick-maturing selection ideal for container growing and small gardens.
Yu choy is one of the most cost-effective vegetables to grow at home. A single packet of seeds ($2-4) contains hundreds of seeds and can plant an entire season of successive crops. Fresh yu choy sells for $3-6 per bunch at Asian supermarkets and $5-8 per pound at farmers markets. Growing just a 3-meter row with succession sowings can yield 8-15 kg over a season, easily saving $50-120 compared to store-bought. The savings are even greater for organic yu choy, which commands premium prices. Since it matures in just 35-50 days, yu choy offers one of the fastest returns on garden investment of any vegetable.
Quick recipes
Garlic Stir-Fried Yu Choy
10 minThe quintessential Cantonese preparation — yu choy flash-fried in a blazing hot wok with garlic until the stems are crisp-tender and the leaves just wilted. A splash of Shaoxing wine at the end adds depth and aroma to this beautifully simple dish.
7 ingredientsBlanched Yu Choy with Oyster Sauce
8 minA staple of Cantonese home cooking and dim sum restaurants — whole yu choy stems blanched until just tender, then arranged on a plate and drizzled with a warm garlic oyster sauce. The clean flavors let the natural sweetness of the vegetable shine.
8 ingredientsYu Choy and Shiitake Noodle Soup
20 minA warming bowl of thin egg noodles in a fragrant ginger-mushroom broth, topped with tender yu choy stems and rehydrated shiitake mushrooms. A comforting one-bowl meal that comes together quickly on a cool evening.
9 ingredientsCulinary Uses
Yu choy is a staple in Cantonese cuisine, typically stir-fried with garlic and oyster sauce. The tender stems, leaves, and flowers are all edible with a mild, sweet cabbage flavor. Blanch briefly and dress with sesame oil for a simple side dish. Add to noodle soups, fried rice, and hot pot. The yellow flowers make an attractive edible garnish.
What's inside
Health Benefits
- Exceptionally high in beta-carotene and vitamin A (over 80% DV per 100g), which support healthy vision, immune function, and skin cell turnover — particularly important for maintaining night vision and protecting corneal health.
- Rich in vitamin C (50% DV per 100g), a powerful antioxidant that supports immune defense, enhances iron absorption from plant foods, and is essential for collagen synthesis in skin, bones, and blood vessels.
- Provides highly bioavailable calcium (105mg per 100g) with low oxalate levels — unlike spinach, the calcium in yu choy is well-absorbed by the body, supporting bone density and muscle function.
- Contains glucosinolates, sulfur-containing compounds found in brassica vegetables that are broken down into isothiocyanates during digestion — these compounds have been extensively studied for their potential anti-cancer and anti-inflammatory properties.
- Good source of folate and iron, both critical for healthy blood cell production. The combination of iron with high vitamin C content in the same vegetable enhances non-heme iron absorption, making yu choy especially valuable for plant-based diets.
- Low in calories (20 per 100g) and rich in dietary fiber, supporting healthy digestion and satiety. The combination of high nutrient density and very low calorie content makes yu choy one of the most nutritionally efficient foods available.
Where Yu Choy comes from
Yu choy (Brassica rapa var. parachinensis), also widely known as choy sum, originated in southern China, where it has been cultivated for well over 1,500 years. It belongs to the vast and diverse Brassica rapa species complex, which includes turnips, napa cabbage, bok choy, and rapini. The warm subtropical climate of Guangdong and surrounding provinces provided ideal conditions for this cool-to-mild weather crop, and it became deeply embedded in the daily food culture of the Cantonese-speaking south.
For centuries, yu choy was a staple of smallholder farms throughout the Pearl River Delta region. Its extraordinary speed from seed to harvest — often just 35-50 days — made it invaluable for market gardeners who could grow six or more successive crops per year. The vegetable's tender flowering stems, mild sweetness, and versatility in the kitchen made it the default everyday green on Cantonese dinner tables, a status it still holds today. Yu choy is so central to Cantonese cuisine that the broader category term 'choy sum' (vegetable heart) has become almost synonymous with this single species in southern Chinese markets.
Chinese immigrants carried yu choy seeds to Southeast Asia, where it became a foundation vegetable in the cuisines of Malaysia, Singapore, Thailand, Vietnam, and Indonesia. It thrives in the tropical lowlands when planted during cooler dry seasons and at higher elevations year-round. In the 20th century, waves of Chinese immigration brought yu choy to North America, Australia, and Europe, where it is now widely grown both commercially and in home gardens. Today it is available year-round in Asian supermarkets worldwide, and Western gardeners are increasingly discovering its remarkable ease of cultivation, rapid growth, and outstanding flavor — qualities that have made it indispensable in Chinese kitchens for over a millennium.
Yu Choy: did you know?
Fascinating facts about Yu Choy
Yu choy (Brassica rapa var. parachinensis) is also known as 'choy sum' in Cantonese, which translates literally to 'vegetable heart' — referring to the prized tender flowering heart of the plant that is considered the most delicious part.
Yu Choy questions, answered
When should I plant Yu Choy?
What are good companion plants for Yu Choy?
What hardiness zones can Yu Choy grow in?
How much sun does Yu Choy need?
How far apart should I space Yu Choy?
What pests and diseases affect Yu Choy?
How do I store Yu Choy after harvest?
What are the best Yu Choy varieties to grow?
What soil does Yu Choy need?
What is the difference between yu choy and choy sum?
Why is my yu choy bolting before it forms thick stems?
Can I eat yu choy flowers?
How is yu choy different from bok choy?
Can I grow yu choy in containers?
How do I store freshly harvested yu choy?
You just read the theory. Now grow it on autopilot.
Everything that makes Yu Choy fiddly — the timing, the spacing, the companions, the harvest window — is exactly what PlotMyGarden handles for you, for every plant in your garden.
A plan that knows your weather
Set your location once. Get sow, feed and harvest dates built around your real last-frost date and live forecast — no more guessing from a generic seed packet.
From the “When to plant” sectionDrag-and-drop bed planner
Design beds on a grid. Every plant snaps to its proper spacing, and you can see your whole season laid out before you spend a cent on seed.
From the “Growing guide” sectionCompanion conflicts, caught early
200+ good-and-bad pairings checked live as you plant — so a season-wrecking mistake never makes it into the ground.
From the “Companions” sectionReminders you'll actually act on
“Water the beans.” “Pick today before it turns.” Timely, specific, and tied to the plants you're really growing.
From the “Harvest” sectionSuccession, scheduled
Want a harvest for six weeks, not six days? It spaces your sowings automatically and reminds you when each new block is due.
From the “When to plant” sectionA record that gets smarter
Every harvest you log teaches it your garden. Next year's plan starts from what actually worked in your soil, not a textbook's.
From the “Overview” sectionPlant these alongside Yu Choy
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Start a free plan today. Lay out your beds, drop in your Yu Choy, and let PlotMyGarden handle the timing, spacing, companions and reminders from seed to harvest basket.