When you say they "are growing by leaps and bounds, do you mean in a skinny and tall fashion. If so, they are likely too crowded to do much....maybe ever. Some vegetables can recover and regrow and others like corn are a one shot plant.

No wayne they are growing normally and spreading out. If you are not familiar with the Earth Box and other SWC they make veggies grow at twice the normal rate than in ground. I just don'r wanna waste my time, space and nutrients with the early producing ones if they will never make edible size heads.

I asked a similar but different question last night, how long have these small heads been there, if they have just appeared, could it just be normal growth? as you are 2 zones higher than me? short thread but attached for info.

Here is a link that might be useful: My question and the answers

heather they have been there since they were in the small cell packs.

Not all zone 8s are the same, ofcourse.
I am also in zone 8 in ATL/GA. For us broccolies do not have much more/longer chances.
Mine have lots of leaves but no heads yet. I am not keeping my fingers crossed.
Probably I will end up with just some greens, no heads.

I would have been thrilled if my broccolies were growing heads.

Ah sorry, I didn't get that from the original post, if it was me I would pull them then, but I know nothing :-) as you can tell :-).
All I can say is so far the advice given to me seems to be holding true, the head has increased in size noticeable in one day, and my other broccoli are showing tiny heads, I only have 6, so easy to keep tabs.
Maybe I should do a time line? I will start tomorrow with the new heads, won't help you, I am afraid but maybe people in the future, I hope by my reply and bumping it you get a more definite answer than mine, but this is only my second year gardening and I am on that steep learning curve :-) but I would pull up, I can't waste space and sounds to me like you are in the same boat?
Good luck.

I am also growing broccoli and I have 8 beautiful plants, but no heads yet! I fear it is becoming too hot and I will let these grow because the foliage is so unique and beautiful. I will start again in august because of the cooler weather!

To hot now. Pull them! Don't waste your time and space.

If you do pull them, use the broccoli greens... they're really good raw or cooked, any way you would use cabbage. I actually prefer them to cabbage, I think they have a better taste.

Earth worm, If they formed tiny heads while in the cell packs, They will never do anything worthwhile. This phenomena is called buttoning ( after the button sized head). The plant has been stunted and will rarely recover. I would suggest to all of you, to examine broccoli and cauliflower plants carefully when buying. I have seen too many sitting in garden centers that have alredy buttoned but still for sale.

Here is a link that might be useful: Broccoli

I've had this exact thing happen to me a few years ago. It was the first time I ever grew broccoli and I didn't realize they weren't supposed to have those little heads on them...they were tiny/young plants at the time. After reading that they were "buttoning", I yanked all but one plant. For some reason, I let that one plant go... Well, it grew a side shoot that didn't create a tiny button broccoli head and you know what? That broccoli was the best broccoli I ever grew! I REALLY regretting pulling all the other plants.

I think you should give them a chance. If no side shoot happens, then yank them.

Catherine