Growing Zinnia in Zone 12b
Zone 12b has a year-round growing season. Zinnia can be planted almost any time with proper planning. Last frost: Jan 1. First frost: Dec 31.
Planting Calendar
Season: Jan 1 – Dec 31 (364 days)
When to Plant Zinnia in Zone 12b
Start Seeds Indoors: Dec 4
Start Zinnia seeds indoors around Dec 4 (4 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 5–10 days.
Transplant Outdoors: Jan 15
Transplant Zinnia seedlings outdoors after Jan 15. Wait until soil temperature reaches 60°F. Space plants at 8/sqft. Harden off plants for a week before moving outside.
Harvest: Mar 6
First harvest approximately Mar 6 (~50 days from transplant). Continue harvesting until first frost (Dec 31).
Zinnia 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 13bFrequently Asked Questions
When should I plant Zinnia in Zone 12b?
Start Zinnia seeds indoors around Dec 4. Transplant outdoors after Jan 15. Expect first harvest around Mar 6.
What is the last frost date for Zone 12b?
The average last spring frost date for Zone 12b is Jan 1. The first fall frost averages Dec 31, giving a 364-day growing season.
Can I grow Zinnia in Zone 12b?
Yes. Zinnia needs 60 days to harvest. Zone 12b has a 364-day growing season, which is sufficient.
What is the best month to plant Zinnia in Zone 12b?
The best time to start Zinnia in Zone 12b is Dec. Begin seeds indoors around Dec 4, then transplant outdoors after the last frost date of Jan 1.
How long does Zinnia take to harvest?
Zinnia takes approximately 60 days from planting to harvest. In Zone 12b, expect your first harvest around Mar 6.
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