Sow your carrot seeds directly into a pre-prepared seed bed in May. If you have heavy clay soil, it’s worth digging in horticultural sand, or sowing your carrot seeds in deep pots using a sandy compost mix to encourage long straight roots to form. Choose a spot in full sun to grow your carrots. If you’re sowing your carrot seeds direct, make a shallow ditch in the soil and thinly sprinkle your carrot seeds along the row, lightly covering with soil before watering your seeds in well. Label each row with the variety and date. As your seedlings develop true leaves, thin them out so each carrot has plenty of space to develop. Cover your carrot plants with fine horticultural mesh as they grow or companion plant with strong-smelling onions and leeks to mask the scent and discourage carrot fly from damaging the roots.