Eatable. The taste is not good.

Blooming broccoli turned out to be too old, not too fresh, and tasted bad.

If the broccoli has been left out for too long and turns yellow and blooms, it is best not to eat it. It is normal for some broccoli to be green on the outside and yellow on the inside because photosynthesis cannot occur without sunlight. However, it is best not to eat broccoli that is also yellow on the outside. It will produce nitrite and is harmful if consumed in excess.