Cabbage / Greens advice

I like curly kale and always grow it, it is come again veg. Last year I grew Cavlo Nero or Black Tuscan cabbage as it is sometimes called. Again it’s a come again veg and very easy to use, very versatile. I also grow spring cabbages called winter Jewel and collards, they are both loose cabbage very green and don’t turn into a head.