This is from seed we got from the Real Seed Company see what they say about it below

"We tried it out and were really impressed. It is the most vigorous and resilient kale we have seen. It shrugged off attack by aphids, cabbage white caterpillars, ravenous goats, and 70 mph freezing sleet overwinter. In each case it sprang back, growing new leaves with no trouble, and forming large heads of Kale in spring when at its most valuable. And when it starts to bolt in spring, the flowering shoots are good to eat too, very much like sprouting broccoli shoots."