Daucus carota 1/8 oz packet sows 35 ft; 1 oz, 280 ft. Carrots average 18,000 seeds/oz with significant variations among varieties.
Culture: Very hardy. Early carrots can be sown by late April. Can take up to 3 weeks to germinate; keep rows from drying out for faster emergence. Sow carrots for winter storage in mid-late June. Thinning is critical: At 3" high thin to 1/2" apart, at 6" thin again to 1" apart. Minimal germination temperature 40°, optimal range 60–85°, optimal temperature 80°. Emergence takes 17 days at 50°, 10 days at 59°, 6 days at 77°, 48% normal seedlings at 41°, 96% normal at 68°.
- ALTS: Alternaria Leaf Spot
- CLS: Cercospora Leaf Spot
- P: Pythium
ALTS shows up first on the oldest foliage as brown-black spots edged with yellow. Foliage blackens and shrivels as it develops and spreads. Maintaining a good crop rotation is the best preventive.