When should I harvest broccoli?

FAQ
Question: 

When should I harvest broccoli?

Answer: 

Broccoli should be harvested when the head is fully developed, but before the flower buds begin to turn yellow and open.  At harvest, the terminal head should be tight, blue-green, and approximately 6 to 7 inches in diameter.  Most broccoli varieties will develop several side heads (about 1 to 3 inches across) in the axils of the leaves after the central head is harvested.  

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