This grower is sure of this plant identification.
Rare perennial variety of kale. Gives multiple harvests throughout the year for several years. Grows up to 120cm tall and 150cm wide. Only the variegated form currently available. More information and propagation instructions here: httpsbackyardlarder.co.uk/plants/daubenton-kale/
Cabbage, Wild cabbage, Broccoli, Kale, Swede, Cauliflower, Brussel sprouts, Turnip
Brassica genus (Cabbage). These are annuals, evergreens, biennials and perennials. They are mainly edible vegetables i.e. cabbages and species of kale.
They are fully hardy and will grow in a sunny position in fertile well drained soil. Lime rich soil is recommended though not essential.
Grown for their vegetables and ornamental foliage.