Blooming 50-Day Choy Sum stems with chopped stems on a white background.
50-Day Choy Sum arranged in a vase with a bowl of chopped stems and leaves on a wooden background.
Blooming 50-Day Choy Sum leaves with chopped stems in bowl and Chinese currency on a stone background.
Blooming 50-Day Choy Sum stems with chopped stems on a stone background.
Blooming 50-Day Choy Sum stems with chopped stems on a white background.
50-Day Choy Sum arranged in a vase with a bowl of chopped stems and leaves on a wooden background.
Blooming 50-Day Choy Sum leaves with chopped stems in bowl and Chinese currency on a stone background.
Blooming 50-Day Choy Sum stems with chopped stems on a stone background.

Choy Sum Seeds,
50-Day

4.914 ReviewsSKU: #OR167Min. seed count: 200
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Description

(Brassica rapa var. parachinensis).  A delectable Chinese vegetable known for its tender and delicious edible stalks and flowers. This green can be planted in both spring and late summer for fall harvest. The greens are nutritious and very flavorful, but most growers in the know savor the flowers and stalks, as they are a gourmet delicacy!

Growing Tips:Choy Sum is a fast-growing leafy green that is valued for both its tender stems and small, edible yellow flowers. This plant prefers cooler temperatures, making it ideal for spring and fall growing. It thrives in well-drained, fertile soil rich in organic matter, and benefits from consistent moisture throughout the growing season.

Plant Details

Botanical Name
Brassica rapa var. parachinensis
Life Cycle
Annual
Sun Requirement
4–6 hr.
Days to Germinate
10–14
Days to Maturity
50
Planting Depth
¼ in.
Plant Spacing
4–6 in.
Ideal Temperature
60–80°F
Frost Hardy
Yes

When to Grow

Choy Sum is best planted in early spring or late summer, as it prefers cooler growing conditions and can tolerate light frost. The 50-day variety refers to its relatively quick maturity, allowing you to harvest in as little as 50 days from sowing. In regions with mild winters, you can also plant Choy Sum in the fall for a winter harvest.

How to Sow and Plant

Sow 50-Day choy sum seeds directly into the garden about 1/4 inch deep. Space the seeds about 4–6 inches apart in rows that are 12–18 inches apart. For a continuous harvest, consider sowing seeds every 2–3 weeks during the growing season. If starting indoors, begin seeds 4–6 weeks before the last frost date and transplant them outside once the seedlings have 2–3 true leaves.

How to Grow

50-Day choy sum requires consistent moisture to grow, so regular watering is essential, especially during dry spells. Mulching can help retain soil moisture and keep weeds down. This plant prefers full sun but can tolerate partial shade, particularly in warmer climates. Fertilize the plants regularly with a balanced organic fertilizer or by side-dressing with compost.

How to Save Seeds

Bok choy is an annual, completing its life cycle in one year. To avoid selecting bolt-prone plants, don't save seeds from prematurely bolted ones. Let plants mature fully, harvest the dried pods, crumble the small round seeds into a jar or bag, then seal and store the seeds in a cool, dark, dry place. Bok choy cross-pollinates with other rapa species but not with different species of Brassica, so it's safe to grow it next to mustard greens (Brassica juncea), for example. To ensure seed purity, isolate your bok choy from other blooming B. rapa by about a half mile or use caging techniques. Allow your healthiest plants to flower for a strong, diverse seed pool.

FAQ

When is the best time to harvest 50-Day choy sum?

Harvest 50-Day Choy Sum when the plants are about 12–18 inches tall, and before the flowers fully open, typically around 50 days after planting. Both the leaves and flower stalks are edible.

Can 50-Day choy sum be grown in containers?

Yes, 50-Day choy sum can be grown successfully in containers. Choose a pot that is at least 8–10 inches deep with good drainage. Ensure the soil stays consistently moist and fertilize it regularly.

Is 50-Day choy sum frost-tolerant?

50-Day choy sum can tolerate light frosts, which makes it suitable for planting in early spring or fall. However, it should be protected from hard frosts to avoid damage to the plants.

Browse our full range of bok choy and tatsoi seeds.

Customer reviews

4.9 / 5 14 Reviews

What gardeners are saying

  • Tender and sweet: Mild, juicy stems and buds; a stir-fry and soup favorite.

  • Sprouts in days: Seed germinates in 24 to 72 hours.

  • Fast crop: Ready in 35 to 50 days; sow in succession for a steady supply.

  • Cut and come again: Resprouts from the base for a second and third picking.

  • Pick young: Bolts in heat and turns woody with age; harvest early.

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