Caulis not great

All of my caulis have now been planted. I lost most of my first planting of the variety 'Bruce' to the maggots of the cabbage root fly despite a squirt of insecticide at the base of each plant after planting. I replanted those stations with plants of 'Cornell' and these seem to be ok. The bed I'm growing them in is probably not ideal as it doesn't get sun from late afternoon but we shall see.