A selection of different kales, tried and tested in the uk climate, offering a wide culinary use. The major benefit to gardeners is providing delicious, highly nutritious greens when the weather is far too cold for other vegetables. Sow march june. Harvest august february.the most reliable, nutritious winter vegetable. Withstands adverse weather conditions to yield a good crop of delicious young foliage and sideshoots in winter and spring.