Depends on how old and at what stage of development? Transplants or grown from seed?

No winds or storms to lay them over? Then most likely it is just the weight of the head - assuming it has developed one. Since you don't give your garden zone or location it is impossible to guess what stage of development they are in.

You can carefully straighten them back up and mound the soil up all around the stem for support.

Another possibility is leggy, weak stems if they didn't get enough sun exposure when young - gives them the "stretched stem" look - or they weren't transplanted deep enough.

Dave

Pics?

Kevin

We were in the city all day yesterday and came home to leaning plants all over the garden, all in the same direction. Winds were high, that's all. :) As long as nothing is broken, the tomatoes will correct themselves. The brassicas might need a little help, though. I'm going out today to nudge them back upright and mound the soil around them again. (I bury them quite a bit when I transplant, but if the top inch is a bit dry, young plants will still tilt a bit in high winds because the soil shifts instead of holds).

Istarted them from seed,so i couldn,t bury them deep.I,m new to broccoli,so i wasn,t sure if it was some sort of root insect, they look better now.