How To Grow Bok Choy in Canada | Complete Guide

Download | How to Grow Bok Choy | Complete Growing Guide (PDF)

Bok choy is a fast-growing, cool-season vegetable known for its tender green leaves and crisp, juicy stalks. It grows well in Canadian gardens during spring and autumn, producing generous harvests in relatively little time.

Temperature management is important when growing full-size bok choy. Prolonged cold exposure followed by warming weather, long days, or heat stress can trigger premature flowering, known as bolting. Choosing suitable planting dates helps produce healthy, full-sized heads.

Bok Choy Growing Guide at a Glance

Feature	Growing Requirement / Detail
Botanical Name	Brassica rapa subsp. chinensis
Plant Type	Cool-season biennial, usually grown as an annual
Sun Exposure	Full sun to partial shade; approximately 4–6 hours or more
Soil	Fertile, moisture-retentive, well-drained soil; pH 6.0–7.0
Start Indoors	3–4 weeks before transplanting
Direct Sow	Spring after prolonged cold has passed, or midsummer to late summer
Sowing Depth	0.5–1 cm (¼–½ inch)
Germination	4–10 days; approximately 18–24°C (64–75°F)
Plant Spacing	25–35 cm (10–14 inches) for full-size heads
Row Spacing	30–45 cm (12–18 inches)
Water Needs	Consistent moisture; approximately 2.5 cm (1 inch) weekly as a starting point
Difficulty Level	Easy to moderate
Container Friendly	Yes; large containers with adequate spacing and drainage

Best Bok Choy Varieties for Canadian Gardens

Bok choy varieties differ in mature size, stalk colour, and growth habit. Some produce large, substantial heads, while others are naturally compact.

Caribou Growing Note: Choose the Right Size

For large, full-size heads, Bopak is a suitable choice. Toy Choy is naturally miniature and will not develop into the same size plant, regardless of growing time. Always check the variety's mature dimensions before planting.

When to Plant Bok Choy in Canada

Spring Planting

Start seeds indoors approximately 3–4 weeks before transplanting, or direct sow once the risk of prolonged cold exposure has diminished.

Avoid exposing young seedlings to repeated chilling or hard freezes. Aim to harvest before sustained summer heat arrives.

Autumn Planting

Direct sow approximately 8–10 weeks before the first expected autumn frost, adjusting for variety maturity. In hot regions, begin seedlings in a cooler, protected location or wait for soil temperatures to moderate.

Established plants tolerate light frost, but growth slows as temperatures and daylight decrease.

Read More | Cold-Hardy Crops to Grow Late Into the Season

Canadian Bok Choy Planting Calendar

Planting dates are approximate. Adjust according to local temperatures, frost dates, and variety maturity.

How to Direct Sow Bok Choy Seeds

Bok choy can be direct sown into garden beds or raised beds. This method avoids transplant shock and is particularly suitable for autumn crops.

Step-by-Step Direct Sowing

1. Choose a Location: Select a fertile, well-drained bed with good sunlight.
2. Prepare the Soil: Loosen the top 15–20 cm (6–8 inches) and incorporate finished compost.
3. Sow Seeds: Plant 0.5–1 cm (¼–½ inch) deep, initially spacing seeds 3–5 cm (1–2 inches) apart.
4. Space Rows: Leave 30–45 cm (12–18 inches) between rows.
5. Water Gently: Keep the soil evenly moist until seedlings emerge.
6. Thin Seedlings: Once true leaves develop, thin to 25–35 cm (10–14 inches) apart for full-size heads.
7. Protect Seedlings: Install fine insect netting early to prevent flea beetle and cabbage pest damage.

For successive harvests, sow small batches every 10–14 days during suitable cool-weather periods.

Read More | Vegetable Garden Spacing Guide: How Far Apart to Plant Vegetables

Bok Choy Seed Germination

Bok choy seeds typically germinate within 4–10 days. Soil temperatures around 18–24°C (64–75°F) encourage reliable emergence.

Tips for Successful Germination

• Use fresh seeds and fine, loose seed-starting mix or prepared garden soil.
• Sow approximately 0.5–1 cm (¼–½ inch) deep.
• Maintain consistent moisture without waterlogging.
• Avoid prolonged extreme heat or cold.
• Protect emerging seedlings from flea beetles.

Poor germination may result from dry soil, excessive heat, deep sowing, waterlogging, or old seeds. Check growing conditions before reseeding.

Starting Bok Choy Seeds Indoors

Starting seeds indoors gives gardeners more control over germination and helps establish healthy seedlings before outdoor planting.

Step-by-Step Indoor Sowing

1. Start seeds approximately 3–4 weeks before the intended transplanting date.
2. Fill seed trays or individual cells with quality seed-starting mix.
3. Sow seeds 0.5–1 cm (¼–½ inch) deep.
4. Maintain temperatures around 18–24°C (64–75°F) for germination.
5. Keep the growing medium evenly moist.
6. After germination, provide 14–16 hours of light daily. Position suitable grow lights approximately 5–10 cm (2–4 inches) above seedlings, adjusting for the fixture.
7. Thin to one strong seedling per cell.
8. Transplant while seedlings are young, generally around 3–4 weeks old.

Avoid leaving seedlings in small cells too long. Root-bound or stressed plants may be more susceptible to bolting after transplanting.

Read More | Seed Starting 101: Beginner Guide for Canadian Gardeners

Hardening Off & Transplanting Bok Choy

Before transplanting, harden off seedlings gradually over 7–10 days. Begin with short periods outdoors in a sheltered location, increasing sunlight and wind exposure each day. Avoid prolonged cold spells and hard freezes.

How to Transplant Bok Choy

1. Choose the Right Day: Transplant during cool, cloudy weather or late afternoon.
2. Water Seedlings: Moisten the growing medium before removing plants from their containers.
3. Prepare Planting Holes: Space holes 25–35 cm (10–14 inches) apart for full-size heads.
4. Handle Carefully: Remove seedlings while keeping the root ball intact.
5. Plant at the Correct Depth: Set seedlings at the same depth as in their trays, keeping the growing point above soil level.
6. Water Thoroughly: Firm the soil gently and water immediately after planting.
7. Protect Young Plants: Use insect netting and provide temporary protection from strong wind or sudden temperature changes.

Maintain generous spacing to allow full-size bok choy to develop broad, healthy stalks and leaves.

How to Prevent Bok Choy from Bolting

Bolting occurs when bok choy begins producing a flower stalk instead of continuing leafy growth. Prolonged cold exposure followed by warming temperatures and lengthening days can trigger flowering. Heat, drought, and other stresses may also contribute.

Ways to Reduce Bolting

• Choose Suitable Planting Dates: Grow bok choy during cool, relatively stable weather.
• Consider Autumn Crops: Shortening days and cooling temperatures often reduce bolting problems.
• Avoid Chilling Seedlings: Protect young plants from prolonged cold exposure.
• Maintain Moisture: Prevent drought stress during rapid growth.
• Choose Suitable Varieties: Select bolt-resistant varieties when available.
• Harvest Promptly: Pick mature heads before flower stalks develop.

Caribou Growing Note: Autumn Is Often Best

If spring crops repeatedly bolt, try growing bok choy for an autumn harvest. Gradually cooling temperatures and shorter days often provide more favourable conditions for full-size heads.

Soil, Sunlight & Fertilizing Requirements

Bok choy grows best in fertile, well-drained soil that retains moisture, with a pH of approximately 6.0–7.0.

Full sun encourages strong growth during cool weather, while partial afternoon shade may help during warmer periods. Aim for at least 4–6 hours of direct sunlight daily.

Incorporate finished compost before planting. Because bok choy is grown for its leaves and stalks, adequate nitrogen supports healthy growth. If additional nutrients are needed, apply a balanced vegetable fertilizer according to soil test results or product directions.

Read More | How to Prepare Garden Soil for Planting: A Canadian Spring Guide

Watering & Mulching Bok Choy

Bok choy has shallow roots and grows rapidly, making consistent moisture essential for tender stalks and healthy leaves.

Provide approximately 2.5 cm (1 inch) of water weekly from rainfall and irrigation combined, adjusting for hot or dry conditions. Water at the base of plants when possible and avoid allowing the soil to dry completely.

Apply a light layer of straw or shredded-leaf mulch to conserve moisture, regulate soil temperature, and suppress weeds.

Growing Bok Choy in Raised Beds & Containers

Raised Beds

Bok choy grows well in raised beds with at least 20–25 cm (8–10 inches) of workable soil. Space full-size plants approximately 25–35 cm (10–14 inches) apart.

Read More | Square Foot Gardening: Maximize Small Spaces

Containers

Choose containers at least 25–30 cm (10–12 inches) deep and wide enough for mature plants. A single full-size bok choy plant can grow in a sufficiently large pot, while wider planters can accommodate several plants.

Use fertile potting mix, provide adequate drainage, and check moisture regularly, especially during warm weather.

Common Bok Choy Pests & Growing Problems

Bok choy belongs to the brassica family and shares many pests and diseases with cabbage, kale, broccoli, and turnips.

Common Pests

• Flea Beetles: Create small holes in leaves, particularly on seedlings. Protect plants with fine insect netting.
• Cabbage Worms: Caterpillars chew foliage and may hide near the centre of plants. Inspect regularly and remove when found.
• Aphids: Cluster on tender growth and within the growing centre. Monitor plants and manage infestations early.
• Slugs and Snails: Damage tender leaves during damp weather.
• Cabbage Root Maggots: Feed on roots, causing wilting and stunted growth.

Diseases & Growing Problems

• Clubroot: Causes swollen roots, stunting, and wilting. Improve drainage and avoid repeatedly planting brassicas in affected soil.
• Downy Mildew: Develops during cool, humid conditions. Improve airflow and reduce prolonged leaf wetness.
• Black Rot: Can cause yellow, V-shaped lesions along leaf margins. Use healthy seed and remove infected plant debris.
• Premature Bolting: Often associated with cold exposure, long days, heat, or stress.
• Yellowing Leaves: May result from ageing, water stress, nutrient deficiency, or root problems.
• Small Heads: Often caused by overcrowding, insufficient light, poor fertility, or inadequate growing time.

If bok choy begins growing tall with a central flower stalk, it is bolting. Harvest promptly while the leaves and stalks remain usable.

When & How to Harvest Full-Size Bok Choy

Full-size bok choy commonly matures in approximately 45–65 days, depending on the variety and growing conditions. Mature plants may reach 25–45 cm (10–18 inches) tall or more.

Harvest when stalks are thick and crisp, leaves are fully developed, and plants have reached their expected mature size. Do not wait for flowering.

How to Harvest the Entire Head

1. Choose a mature plant with healthy, fully developed stalks.
2. Use a clean, sharp knife to cut the head at its base, just above the soil line.
3. Remove damaged outer leaves.
4. Rinse thoroughly, paying attention to soil trapped between stalks.
5. Refrigerate promptly.

Harvesting Individual Leaves

For an extended harvest, remove a few mature outer leaves while leaving the central growing point intact. However, harvesting the entire plant at maturity is generally preferable when growing large, full-size heads.

Caribou Growing Note: Harvest Before Flowering

Check bok choy frequently as it approaches maturity. Once a flower stalk develops, leaves and stalks may become tougher or more bitter. Harvest promptly for the best flavour and texture.

How to Store Bok Choy

Refrigerator Storage

Remove damaged leaves and keep the head intact until ready to use. Place unwashed, surface-dry bok choy in a loosely closed or perforated produce bag in the refrigerator's vegetable drawer.

For the best freshness and texture, use within approximately 3–7 days.

Freezing Bok Choy

Bok choy can be frozen for cooked dishes, although its crisp texture will soften after thawing.

1. Wash thoroughly and separate the stalks.
2. Cut into manageable pieces.
3. Blanch briefly in boiling water, approximately two minutes for small pieces.
4. Cool immediately in ice water.
5. Drain thoroughly and pack into freezer-safe containers.
6. Freeze and use in soups, stir-fries, or other cooked dishes.

How to Use Bok Choy in the Kitchen

Both the leaves and stalks of bok choy are edible. The thick, crisp stalks take slightly longer to cook than the tender green leaves.

For stir-fries, add chopped stalks first, followed by the leaves. Bok choy is also excellent steamed, sautéed with garlic and ginger, or added to soups and noodle dishes.

Wash carefully between the stalks, where garden soil can collect.

Frequently Asked Questions About Growing Bok Choy

What is the difference between baby bok choy and full-size bok choy?

Baby bok choy may be harvested young or grown from naturally compact varieties. Full-size bok choy develops larger leaves and thicker stalks. Check the variety's mature size before planting.

Why is my bok choy bolting?

Prolonged cold exposure followed by warming weather, lengthening days, heat, drought, or other stress can trigger premature flowering.

Can I stop bok choy from bolting once it starts?

Once a flower stalk begins developing, the process generally cannot be reversed. Harvest while the leaves and stalks remain usable.

Is autumn better than spring for growing bok choy?

Often, yes. Autumn crops benefit from shortening days and gradually cooling temperatures, which can reduce bolting problems.

Can bok choy survive frost?

Established plants can tolerate light frost, but prolonged freezing can damage leaves and stalks. Young plants should be protected from extended cold exposure.

Why is my bok choy small?

Overcrowding, poor fertility, insufficient sunlight, irregular watering, or inadequate growing time can prevent full-size development. Some varieties are also naturally compact.

Can you eat bok choy after it bolts?

Yes, provided the plant remains healthy. However, the leaves and stalks may become tougher or more bitter after flowering begins.

Can you harvest bok choy more than once?

Yes. You can harvest individual outer leaves while leaving the growing centre intact. For large, full-size heads, harvesting the entire plant is usually preferable.

Grow Bok Choy from Seed Today

Whether you're growing full-size heads for stir-fries or compact varieties for small-space gardening, bok choy is a productive addition to Canadian spring and autumn gardens.

Featured Bok Choy Seeds

	Bok Choy 'Bopak' A versatile bok choy with tender green leaves and crisp, sweet stalks. Suitable for harvesting young or allowing plants to develop into full-size heads. Shop Bopak Seeds
	Bok Choy 'Toy Choy' A miniature bok choy with dark green leaves and white stems. Ideal for individual servings, containers, sautéing, and roasting. Shop Toy Choy Seeds

Download | How to Grow Bok Choy | Complete Growing Guide (PDF)

See You in the Garden!