Carrots are best grown in sandy, well prepared soil which has been previously manured at least 6 months before you decide to sow your seeds (don’t worry if you have not manuared your patch before you sow, just make sure you add some good organic compost and fertilizer). However if your soil is heavy clay, stony and doesn’t drain well, then you should only plant main crop short rooted varieties of carrots.
Carrots take between 12 and 16 weeks to mature to full size but you can use the thinnings or pull them earlier and use a baby carrots.