Your Rudolph psb is an early variety - meaning early in the winter. Expect it to produce December time. For spring crops you need Red Arrow or Claret or something like this. They mature from March into April. Sow these during May.

I'm not sure what is going to happen to your April cabbage - this is a spring cabbage which you would normally sown in August for harvest in April the next year. I don't know how it will react to being sown in February and grown through the warm months... keep an eye on it and make sure pick it before it gets a chance to bolt.

Your calabrese and cauliflower will probably mature late summer, and the first sprouts in early autumn, though this depends on the variety.