Botanical Name: Daucus carota
Days to Maturity: 65 days
Native: Africa, Eurasia
Hardiness: Frost-tolerant biennial grown as an annual
Plant Dimensions: Roots are 1"–2" long at their peak.
Variety Information: Dark orange, round root, sweet and tender. 'Tonda di Parigi' is a French heirloom in a class of its own; it does not fall into any of the four primary carrot types (chantenay, nantes, danvers, and imperator).
Attributes: Good for Containers , Good for Heavy Soil
When to Sow Outside: RECOMMENDED. 2 to 4 weeks before your average last frost date, and when soil temperature is at least 45°F, ideally 60°–85°F. Successive Sowings: Every 3 weeks until 10 to 12 weeks before your average first fall frost date. In very warm climates, carrots are grown primarily in fall, winter, and spring.
When to Start Inside: Not recommended; root disturbance stunts growth.
Days to Emerge: 10–25 days
Seed Depth: ¼"
Seed Spacing: 1"
Row Spacing: 6"
Thinning: When 1" tall, thin to 1 every 2"
Harvesting: For best flavor and texture, harvest carrots any time before, and until they reach their optimal size. Peak harvest period lasts about 3 weeks, longer in the fall. Late summer-sown carrots are sweetened after having been kissed by light frost; however, harvest before soil freezes, which may destroy the crop. In USDA zone 5 or warmer, carrots can be left in the ground for storage provided they are heavily mulched; harvest as needed on days the ground is not frozen.