Carrots adapt to a variety of soils, but do best in loose, rich soil with plenty of sun. Plant early and use successive sowings for a continuing fresh supply. Seed is slow to germinate so use a crop like radish to mark rows. Keep tops of roots covered so light does not turn them green, and keep evenly watered to prevent splitting. Carrot seed varies in size and usually averages between 15,000 and 22,000 seeds per ounce. A packet contains a minimum of 750 seeds unless noted and plants a 20 to 25 foot row, 1/4 oz about 100 feet.