Choy Sum: Green 70D Improved
Choi Sum: Green 70 D Improved Non-GMO | Heat-Tolerant | The Classic Flowering Cabbage · The Culinary Edge 🌼 A staple of Hong Kong and Taiwanese night markets, Choi Sum is the crown jewel of flowering brassicas. Unlike standard bok choy,...
Choi Sum: Green 70 D Improved
Non-GMO | Heat-Tolerant | The Classic Flowering Cabbage
The Culinary Edge 🌼
A staple of Hong Kong and Taiwanese night markets, Choi Sum is the crown jewel of flowering brassicas. Unlike standard bok choy, Choi Sum is grown for its succulent, bright green stems and delicate yellow flower buds. The Green 70 D Improved variety is specifically selected for the chef-grower who needs reliability; it is remarkably heat-tolerant and stays sweet and tender even when other greens might bolt. Harvested just as the first flowers begin to peek out, it offers a sophisticated, crunchy texture that is the hallmark of high-end Cantonese cuisine.
100+ Seeds per Packet
At A Glance:
| Feature | Specification |
| 👅 Flavor Profile | Extra Sweet / Mild Mustard Note |
| 🎨 Visual Contrast | Vibrant Green Stems / Bright Yellow Buds |
| ⏱️ Maturity | 45–55 Days |
| 🔢 Quantity | 100+ Premium Seeds per Packet |
✨ Flavor Profile
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Peak Sweetness: Choi Sum is naturally higher in sugar than most Asian greens, offering a juicy, refreshing crunch without any harsh bitterness.
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Tender Stems: The stalks are the prize—thick and succulent yet incredibly easy to bite through, with a texture that bridges the gap between asparagus and celery.
🍴 Culinary Versatility
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The "Hong Kong" Classic: Simply blanch the whole stalks and serve drizzled with oyster sauce and sesame oil for a traditional, high-impact side dish.
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Flash Stir-Fry: Its high water content allows it to sear beautifully in a hot wok, maintaining its vibrant green color and snap.
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Soups & Broths: Add the tender stems and flowering tops at the very end of a noodle soup to let them wilt perfectly in the residual heat.
🌱 Growing Notes
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Heat Tolerance: While most greens struggle in the peak of Montreal's July, Green 70 D is improved to handle temperature spikes, ensuring a successful harvest through the summer.
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Cut-and-Come-Again: This variety is highly prolific. If you harvest the main stem, the plant will regrow side shoots, providing you with multiple harvests from a single planting.
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The "Bud" Harvest: For the best culinary quality, harvest the stalks when they are about 8–10 inches tall, just as the yellow flower buds are beginning to form but before they fully open.
Start indoors 8–10 weeks before last frost. Germinate at 26–30 °C on a heat mat; peppers stall below 22 °C. Pot up to 10–15 cm before hardening off outside after nights stay above 12 °C.
Feed balanced through bloom, then bump potassium for fruiting. Stake taller varieties. More detail in our full Canadian growing guide.
Match the pepper to the technique: thin-walled varieties blister fast in a hot pan; thick-walled ones roast or stuff beautifully; fruit-forward ones make balanced sauces and pickles. The variety's flavour profile is your shortcut — see Choosing the right pepper for a use-case guide.




