When should I plant Slunečnice in Zone 4a?

Start Slunečnice seeds indoors around Apr 14. Transplant outdoors after May 12. Expect first harvest around Jul 16.

What is the last frost date for Zone 4a?

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

Can I grow Slunečnice in Zone 4a?

Yes. Slunečnice 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 Slunečnice in Zone 4a

Zone 4a has cold winters and a moderate growing season. Timing is key for Slunečnice in this zone. Poslední mráz: May 5. První mráz: Oct 1.

Planting Calendar

Indoor

Outdoor

Harvest

Apr 14Oct 1

Season: May 5 – Oct 1 (149 dní) · Succession: plant every 2 weeks (up to 4x)

Zóna4a

Poslední mrázMay 5

První mrázOct 1

Sezóna149 dní

Sklizeň90 dní

SluncePlné Slunce

When to Plant Slunečnice in Zone 4a

Start Seeds Indoors: Apr 14

Start Slunečnice seeds indoors around Apr 14 (3 týdnů před posledním mrazem). Optimal germination temperature: 75F. Germinates in 7-14 days.

Transplant Outdoors: May 12

Transplant Slunečnice seedlings outdoors after May 12. Wait until soil temperature reaches 55F. Space plants at 1/m² (30cm od sebe). Harden off plants for a week before moving outside.

Harvest: Jul 16

First harvest approximately Jul 16 (~65 dní from transplant). Continue harvesting until first frost (Oct 1).

Smíšená Výsadba

✅ Okurky✅ Dýně ✅ Kukuřice✅ Fazole

❌ Brambory

Slunečnice 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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