It looks like radishes to me. The bulb is going to be very tough and woody but the seed pods are tasty. You can eat them raw or stir fry them.

I always thought Radish were a small plant. These are massive. Thank you for your response :-).

Most likely a winter radish. Most of them get large roots. There is a variety (Sakurajima)that can go over a 100 lbs.

Radish for sure.
I also think it is winter/fall radish, since has white flowers. Red radishes normally have pink flowers. Right now I happened to have both of them in my garden. The white flowered one is from last winter's Chinese/ Korean radishes.

Another thing: When radishes bolt they grow quite tall an big.