f 1 Generation Hybrid Vigourharvestable Year Round great Windbreak For Nearby Cropscabbage duncan f 1 Hybrid Is Probably The Most Versatile Cabbage In The World! Sown In February This Pointed Variety Is Ready By Mid-june.successional Sowings Will Give Long-standing Hearts Through Summer To October, Leafy Greens From October To March & Hearted Spring Cabbages Through To June.a Row Of Cabbage Duncan Will Also Act As A Great Windbreak To Nearby Tender Crops Or Companion Bedding Nearby Of Marigolds Or Alyssum. nothing Beats Cabbages As Far As Versatility Is Concerned. With Ballheaded, Red, Green & Savoy, They Have So Many Uses In The Kitchen Both In Cooking & Salads, Making Them The Perfect Home-grown Crop.