The Romanesco's were the healthiest of the Brassicas when they were young. They were the least affected by the Aphids (read about that here)
and they have been the worst affected as they started to develop.
The heat caused them to turn purple and many bolted. That is the price one has to pay for planting a winter crop in summer.
The Cauliflowers which were doing pretty badly as seedlings have grown to be much healthier that the Romanesco's or the Brocolli's.
And we have harvested a few nice ones.
See how massive they are
I did soak them in warm salt water bath for a few minutes, and out came a few worms. Something I have NEVER seen happen in my supermarket bought produce. I am assuming it is because we did not use anything (other than some Neem) on these.