they are one of mine too shades
if you like kale do try the red variety - I grow the curly, red and black and in the bed where they are they look a fabulous array of colours altogether, I can hardly bring myself to cut them :'(
g'veg if the weather stays warmish (look out for the full moon at the end of the month) then a plastic bottle over them might encourage pests but netting essential as sad says