Cabbage Cabbice F1 Seeds produce sweet, crunchy 2kg heads perfect for salads or traditional dishes. Sow indoors from February to March at 13°C, or outdoors in shallow drills for later sowing. Thin seedlings to one per cell, harden off, and transplant outdoors, spacing plants 45cm apart with 60cm between rows. For outdoor sowings, thin to 7-10cm and transplant when plants reach 15cm tall. Harvest from September to October.