Any one know how to improve my broccoli, the heads are only about 3 inches.
Ours too. The variety is "Early Dividend". I think they got overheated/underwatered at some point before transplant and it made them head up early and small, aka bolt.
Could be called "buttoning up". When broccoli is exposed to cold temps http://ohioline.osu.edu/b672/broccoli.html
Even though I live in NC, Ohio State has a great website for veg. production bulletins.