When should I plant Hướng dương in Zone 4a?

Start Hướng dương seeds indoors around 14 Th4. Transplant outdoors after 12 Th5. Expect first harvest around 16 Th7.

What is the last frost date for Zone 4a?

The average last spring frost date for Zone 4a is 5 Th5. The first fall frost averages 1 Th10, giving a 149-day growing season.

Can I grow Hướng dương in Zone 4a?

Yes. Hướng dương needs 90 days to harvest. Zone 4a has a 149-day growing season, which is sufficient. You can plant up to 4 successions.

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🌻 Growing Hướng dương in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Hướng dương in this zone. Sương giá cuối: 5 Th5. Sương giá đầu: 1 Th10.

Planting Calendar

Indoor

Outdoor

Harvest

14 Th41 Th10

Season: 5 Th5 – 1 Th10 (149 ngày) · Succession: plant every 2 weeks (up to 4x)

Vùng4a

Sương giá cuối5 Th5

Sương giá đầu1 Th10

Mùa vụ149 ngày

Thu hoạch90 ngày

Ánh sángNắng hoàn toàn

When to Plant Hướng dương in Zone 4a

Start Seeds Indoors: 14 Th4

Start Hướng dương seeds indoors around 14 Th4 (3 tuần trước sương giá cuối). Optimal germination temperature: 75F. Germinates in 7-14 days.

Transplant Outdoors: 12 Th5

Transplant Hướng dương seedlings outdoors after 12 Th5. Wait until soil temperature reaches 55F. Space plants at 1/m² (30cm khoảng cách). Harden off plants for a week before moving outside.

Harvest: 16 Th7

First harvest approximately 16 Th7 (~65 ngày from transplant). Continue harvesting until first frost (1 Th10).

Cây trồng đồng hành

✅ Dưa chuột✅ Bí ✅ Ngô✅ Đậu

❌ Khoai tây

Hướng dương in Other Zones

1a 1b 2a 2b 3a 3b 4a 4b 5a 5b 6a 6b 7a 7b 8a 8b 9a 9b 10a 10b 11a 11b 12a 12b 13a 13b

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