The Cabbage Butterfly have been so busy whilst I have been away. Quite the worst damage I have ever encountered. Can you tell the Sprouting Broccoli from the cane? They have had every scrap of leaf and started on the stalks.

Is all lost for this year? Well maybe not I see it as a challenge. Cabbage Butterflies were designed to eat Cabbages and I suppose Cabbages were designed to be eaten by them. Yet the species have survived without man's intervention.
The rescue procedure will involve making sure the plants want for nothing, I have cleared away the weeds, forked the ground around them then firmed the plants with my heel.
Next step was a liquid fed of a high Nitrogen content.

Today they will get a mulch of well rotted compost.
Let us follow the progress to see if we can get a worthwhile crop despite all.
technomist
You really are taking on a challenge there. I will be interested to see who wins.