CABBAGE CELTIC F1 ~ AGM winning short stemmed firm hearted ballhead: reliable, attractive and tasty 20 seeds SOW: during March to May: we prefer to start seeds in modules or pots to give them good root growth in preparation for planting out. GROW: harden off and plant out about 5/6 weeks after sowing. Space 40-45cm apart. Cut the cabbages as you need them between late November and January. EAT: Store in a poly bag for up to a week in a fridge. We prefer to steam our cabbage but you can cook it in boiling water. To Freeze – shred or cut, blanch for 1 minute, plunge into cold water, drain and pack into portions.