Cowpeas bloom continuously for about 3 months but with a caveat that some varieties tend to produce one or two huge flushes of blooms and then either die back or else are so decrepit they do not produce significant new beans. Your varieties will re-bloom.

DarJones

I would only add that care should be taken when harvesting. Some new buds will develop from the fragile tips of the flower stalks, so try not to break them off.

Thank you DarJones and Zeedman. I do see some blooms but it's not as many as when they first came up, it seems. Should I add more Nitrogen or anything to encourage them to flower more heavily?