Answer: The heads that form on broccoli are actually the immature flower buds (or inflorescence). In order to develop flowers a plant must be mature. In the case of your father's broccoli crop, two things may be happening; the plants may have been overfed which would produce lots of green stalk, and the plants are not yet mature enough to develop flower buds. Broccoli usually takes from 80 to 102 days to mature from transplant size, so yours should be at least beginning to develop heads within the next week or two. Don't give up on them just yet!
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