When to Plant Dahlia in Unknown
State
Unknown
Cities Covered
13
USDA Zones
5a, 7a, 7b, 8b, 9a, 9b
Plant Type
Indoor Start
📅 Planting Calendar for Unknown
Based on ZIP 32143 (Zone 9b). Dates may vary by city.
Start Seeds Indoors Tuesday, December 30, 2025
Transplant Outdoors Tuesday, February 17, 2026
Note: Unknown spans multiple zones (5a, 7a, 7b, 8b, 9a, 9b). Select your city below for more precise dates.
🌿 Plant Details
Scientific Name Dahlia pinnata
Days to Maturity 90 days
Sun Requirements Full Sun (6-8 hours)
Plant Spacing 18" apart
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Growing Dahlia in Unknown
Dahlia (Dahlia pinnata) is a popular garden vegetable in Unknown. The state spans USDA Hardiness Zones 5a, 7a, 7b, 8b, 9a, 9b, so planting dates can vary significantly depending on your location.
For most of Unknown, you should start Dahlia seeds indoors around Tuesday, December 30, 2025, then transplant outdoors around Tuesday, February 17, 2026.
For the most accurate planting dates, enter your ZIP code on our homepage or select your city from the list above.