New Jersey’s coastal climate supports bok choy from April through May and again in September. Knowing the best time to plant bok choy in New Jersey is key to a crisp, tasty harvest. This guide walks you through the exact timing, soil prep, and care steps for your garden.
Best Time To Plant Bok Choy In New Jersey
Bok choy thrives in cool weather. It bolts quickly in heat, so timing matters. In New Jersey, you have two main planting windows: early spring and late summer.
Spring Planting Window
Start seeds indoors 4-6 weeks before the last frost. For most of New Jersey, that’s mid-March to early April. Transplant seedlings outdoors after the soil warms to at least 40°F.
Direct sow seeds in the garden from early April to mid-May. Aim for soil temperatures between 45°F and 75°F. If a late frost hits, cover young plants with row covers.
- Last frost dates: South Jersey (April 15), Central Jersey (April 20), North Jersey (May 1)
- Best spring harvest: 45-60 days after planting
- Plant in full sun to partial shade
Fall Planting Window
Fall is actually easier for bok choy in New Jersey. The weather cools down, and pests are less active. Plant seeds directly in the garden from late July to early September.
Count backward from your first fall frost date. For most of New Jersey, that’s mid-October to early November. Plant 6-8 weeks before that date.
- South Jersey: Plant from August 1 to September 1
- Central Jersey: Plant from July 25 to August 25
- North Jersey: Plant from July 15 to August 15
Fall bok choy often tastes sweeter. Cool nights boost sugar content. Plus, you avoid the spring rush of weeds and insects.
Understanding New Jersey’s Climate Zones
New Jersey spans USDA hardiness zones 6a to 7b. The coastal areas are warmer, while the northwest mountains are cooler. Your exact location shifts the planting calendar by a week or two.
Coastal South Jersey (Zone 7B)
Near Atlantic City or Cape May, winters are mild. Spring comes earlier. You can plant bok choy as early as late March. Fall planting can stretch into early September.
Soil warms faster here. Use shade cloth if temps spike in April. Bok choy can handle light frost, but not a hard freeze.
Central Jersey (Zone 7A)
Areas around Trenton and New Brunswick have moderate weather. Plant spring crops from early April to mid-May. For fall, aim for mid-August planting.
Watch for sudden warm spells in May. If temps hit 80°F, your bok choy may bolt. Have a backup plan to harvest early.
Northern Jersey (Zone 6A-6b)
Sussex and Bergen counties are cooler. Spring planting starts in late April. Fall planting should be done by mid-August to ensure harvest before frost.
Use cold frames or row covers to extend the season. Bok choy can survive light frosts down to 25°F, but protect it from harsh winds.
Soil Preparation For Bok Choy
Bok choy needs rich, well-draining soil. Test your soil pH first. Aim for a pH between 6.0 and 7.5. Add lime if it’s too acidic.
Mix in 2-3 inches of compost or aged manure before planting. This provides nitrogen for leafy growth. Avoid fresh manure—it can burn roots.
- Loosen soil to 12 inches deep
- Remove rocks and debris
- Add balanced fertilizer (10-10-10) at planting time
If you have heavy clay soil, raise beds help. Bok choy roots need air. Raised beds warm faster in spring too.
Container Growing Tips
No garden space? Use pots at least 8 inches deep. Fill with quality potting mix. Place containers where they get 4-6 hours of sun daily.
Container plants dry out faster. Water every 1-2 days in warm weather. Add slow-release fertilizer for steady growth.
Planting Bok Choy Step By Step
Follow these steps for a successful crop. Adjust timing based on your local weather, not just the calendar.
Step 1: Choose Your Variety
Select a variety suited to your season. For spring, try ‘Joi Choi’ or ‘Black Summer’. For fall, ‘Win-Win’ or ‘Shanghai Green’ work well.
Baby bok choy varieties mature in 30-40 days. Full-size types take 45-60 days. Mix both for continuous harvest.
Step 2: Prepare Seeds Or Seedlings
Seeds are cheap and easy. Sow them 1/4 inch deep, 1 inch apart. Thin seedlings to 6-8 inches apart once they have 2 true leaves.
Transplants save time. Buy healthy seedlings from a nursery. Harden them off over 3-4 days before planting outdoors.
Step 3: Plant At The Right Depth
Set transplants at the same depth they were in the pot. Bury the stem too deep and it may rot. Space plants 8-10 inches apart for full heads.
For direct sowing, plant 2-3 seeds per hole. Thin to the strongest seedling. Water gently after planting.
Step 4: Water Consistently
Bok choy needs 1-2 inches of water per week. Keep soil moist but not soggy. Mulch around plants to retain moisture and suppress weeds.
Drip irrigation works best. Overhead watering can cause leaf diseases. Water in the morning so leaves dry by night.
Step 5: Fertilize Lightly
Side-dress with compost or fish emulsion 3 weeks after planting. Avoid high-nitrogen fertilizers—they make leaves tough.
If leaves turn yellow, add a balanced liquid fertilizer. Too much nitrogen causes lush growth that attracts aphids.
Common Pests And Diseases
Bok choy in New Jersey faces a few pests. Flea beetles are the worst. They leave tiny holes in leaves. Use row covers to block them.
- Aphids: Spray with neem oil or insecticidal soap
- Cabbage worms: Handpick or use Bt (Bacillus thuringiensis)
- Slugs: Set beer traps or use diatomaceous earth
Diseases are less common. Downy mildew appears in wet weather. Space plants for air flow. Avoid overhead watering.
Rotate crops yearly. Don’t plant bok choy where other brassicas grew last season. This reduces soil-borne diseases.
Harvesting Bok Choy At The Right Time
Harvest when heads are firm and leaves are dark green. For baby bok choy, pick when 4-6 inches tall. Full-size heads are ready at 10-12 inches.
Cut the stem at soil level with a sharp knife. Leave the root in the ground—it may regrow for a second harvest. Water well after cutting.
Harvest in the morning for crispness. Bok choy wilts quickly in heat. Rinse and store in the fridge in a plastic bag. It keeps for 5-7 days.
Signs Your Bok Choy Is Ready
- Leaves are firm and glossy
- Stems are thick and white
- No yellowing or wilting
- Heads feel dense when squeezed
If you see a flower stalk forming, harvest immediately. The plant is bolting. Leaves become bitter once flowering starts.
Extending The Growing Season
Use season extenders to push the boundaries. Cold frames let you plant 2-3 weeks earlier in spring. They also protect fall crops from early frost.
Row covers add 5-10°F of warmth. Drape them over hoops or directly on plants. Remove them on sunny days to prevent overheating.
For a winter harvest, plant in late August. Use a cold frame or unheated greenhouse. Bok choy can survive down to 20°F with protection.
Succession Planting For Continuous Harvest
Plant a new batch every 2 weeks. This gives you a steady supply from spring through fall. Stop planting 8 weeks before your first frost.
In spring, start with fast-maturing baby varieties. Switch to full-size types for fall. Adjust spacing for smaller plants.
Frequently Asked Questions
Can I plant bok choy in New Jersey during summer?
Summer heat causes bolting. Only plant if you provide shade cloth and consistent water. Even then, quality drops. Stick to spring and fall.
What is the best month to plant bok choy in New Jersey?
April is best for spring planting. August is best for fall planting. Exact dates depend on your zone and local weather.
How long does bok choy take to grow in New Jersey?
Baby varieties mature in 30-40 days. Full-size types take 45-60 days. Cool weather slows growth, but improves flavor.
Can I grow bok choy in partial shade in New Jersey?
Yes. Bok choy tolerates 4-6 hours of sun. Partial shade actually helps in warmer months by reducing heat stress.
Should I soak bok choy seeds before planting?
Soaking is optional. It speeds germination by 1-2 days. Soak for 4-6 hours in room-temperature water, then plant immediately.
Final Tips For Success
Start small. Plant a test patch first. Note the weather and harvest dates. Adjust next season based on what works.
Keep a garden journal. Write down planting dates, frost dates, and pest issues. Over time, you’ll fine-tune your schedule.
Share your harvest with neighbors. Bok choy is versatile in stir-fries, soups, and salads. It’s a rewarding crop for New Jersey gardeners.
Remember, the best time to plant bok choy in New Jersey is when the soil is cool and the air is mild. Spring and fall are your windows. With proper care, you’ll enjoy fresh bok choy from your own garden.