Sounds like black aphids. We get them on nasturtiums, lupines,
and fava beans.
Aphid controls: insecticidal soap, dish soap (beware the "inert
ingredients"), ladybugs, green lacewings, blasting them off
with the hose (they come back, so I am not especially fond of
this method), etc. There are probably some other mild, organic
insecticides that will kill them, but I am not familiar with them.
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