Don't give up on the broccolli because it has gone to flower. I think most varieties of broccolli will continue to produce until the killing frost puts them down in late October. Remove the flower stem and and give the plant some time and it will produce many smaller heads. If the plant gets very large remove some of the side trunks and new ones will emerge from the base of the leaves that you leave intact. Harvest all summer!

Can you still eat the brocolli after it has bolted or do it become poisonous?

I live in Texas and grow Broccoli all year round from the same plants. The only thing that kills them is a hard freeze. They are really easy to grow and don't require a lot of care except water and occasionally some bug spray.

Once the big heads are harvested in the spring (much like the ones you find in the store), the heads diminish in size, usually down to the size of a nickel. Broccoli has to be picked at least once a week if not more often. If picked on time it won't flower. If it does, cut them off and throw them on the ground as compost.

Broccoli, however will tail off in the extreme heat of July, August and September. Keep watering and when the temps get cooler it will produce again in early to late fall.

The good thing about Broccoli is that it freezes well. Each time you pick it, wash it off and throw it in a freezer bag and put it directly in the freezer.

Aside from picking it, Brocolli is one of the top three easy to grow and low maintenence crops next to onions and carrots.

I have been gardening for over 13 years.