Growing Dahlia in Zone 11b
Zone 11b has a year-round growing season. Dahlia can be planted almost any time with proper planning. Last frost: Jan 15. First frost: Dec 31.
Planting Calendar
Season: Jan 15 – Dec 31 (350 days)
When to Plant Dahlia in Zone 11b
Start Seeds Indoors: Dec 4
Start Dahlia seeds indoors around Dec 4 (6 weeks before last frost). Optimal germination temperature: 75°F. Germinates in 7–14 days.
Transplant Outdoors: Jan 29
Transplant Dahlia seedlings outdoors after Jan 29. Wait until soil temperature reaches 60°F. Space plants at 18/sqft. Harden off plants for a week before moving outside.
Harvest: Apr 9
First harvest approximately Apr 9 (~70 days from transplant). Continue harvesting until first frost (Dec 31).
Dahlia 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 Dahlia in Zone 11b?
Start Dahlia seeds indoors around Dec 4. Transplant outdoors after Jan 29. Expect first harvest around Apr 9.
What is the last frost date for Zone 11b?
The average last spring frost date for Zone 11b is Jan 15. The first fall frost averages Dec 31, giving a 350-day growing season.
Can I grow Dahlia in Zone 11b?
Yes. Dahlia needs 90 days to harvest. Zone 11b has a 350-day growing season, which is sufficient.
What is the best month to plant Dahlia in Zone 11b?
The best time to start Dahlia in Zone 11b is Dec. Begin seeds indoors around Dec 4, then transplant outdoors after the last frost date of Jan 15.
How long does Dahlia take to harvest?
Dahlia takes approximately 90 days from planting to harvest. In Zone 11b, expect your first harvest around Apr 9.
Plan Your Dahlia Garden
Track Dahlia from seed to harvest with personalized frost dates, watering recommendations, and companion planting visualization.
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