Could be any number of reasons why Broccoli will "button" i.e. form tiny flower
heads, Primary reason is usually the the plant was stunted somewhere alon it
growth cycle, I have seen plants kept in theier trays too long and actually
button before transplanting. Sometimes a cold snap will cause the same
phenomena in the garden, Cabbage root maggots and root diseases will also cause
this, If your plants are growing well, then harvest the button and hope for
more normal side shoots. Once the flowers open up the plant will divert all its
energy to producing seeds,
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