May, Jun, Jul
Water carrot seedlings well before thinning. This will allow you to pull them out without breaking the roots, the smell of which attracts carrot root fly. Simply grip the seedling to be removed between thumb and forefinger and pull. Aim to leave seedlings at 2cm - 4cm spacings. Cover with horticultural fleece to ward off carrot root fly.
After three to four weeks, repeat the thinning procedure to leave the seedling at a spacing of 4cm - 8cm apart. This second thinning usually produces tiny carrots that can be trimmed for use in salads or as a garnish.