I don't have a definite answer for you, just a strong suspicion that these will do nothing at this point. I have read that cauliflower are much more difficult to grow than broccoli or cabbage (other members of the family). I am trying this year for the second time with no apparent success.

I am interested to see what other people say. Maybe at this point, I should rip my one plant out.

I did some further research on this, for my own future reference. In addition to the tips listed in the attached link, several sites mention that cauliflower don't like soil that is loose. The main problem seems to be that if anything disrupts steady growth, they won't come to a head and so many factors could disrupt growth. With so much else going on in my garden, I think I will wait until I retire to try this one again.

Here is a link that might be useful: tips on growing cauliflower

Thanks for the info asarum. For now I am going to leave the cauliflower in the ground. The one plant that grew a head was the smallest of them all. The rest of the plants have continued to grow leaves and look perfectly healthy. They just won't grow a head. I Sprinkled some triple phosphorus around some of them and worked it into the soil. I will see how it works out. I figured I would experiment at this point.

Just an update. Boy am I glad I didn't rip up the cauliflower. I was looking it over tonight and I noticed 4 little heads forming. I hope to pick some in about a week or two. Hopefully the temperatures don't get too hot. I can't wait.