Gardeners often pinch out the tops of broad beans to curb black fly. We very rarely pinch out the tops. But if blackfly are a problem, the tips may be pinched out when the first pods are set.
To pinch out the tops:
* first select the top of the broad bean plant
* find broad bean top
* Hold the tip between finger and thumb
* pinch the tip so that it breaks away from the plant
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