Harvest in 12-18 weeks. Compatible with (can grow beside): Onions, Leeks, Lettuce, Sage, Peas, Radishes, Tomatoes, Beans, Celery, Rosemary Avoid growing close to: Parsnips, Beetroot, Dill, Brassicas, Fennel A hardy root vegetable which grows well in deep cool soil. Carrots take about 3 weeks to show themselves and the first leaves look like grass . If broadcast sowing, mix with radish seeds which will germinate quickly and indicate the sown area. In hotter or dry areas, water well before seeding then cover with boards to maintain the moisture and cool soil for more successful germination. Check every week or so. Over fertilised ground will produce split roots. Protect against carrot fly. It is best to put carrots in a different area of the garden each year for four or five years.