P. vulgaris varieties are much more productive in my gardens in the mid-Atlantic.
P. coccineus tends to shut down early for me as summer's heat and humidity builds - it is quite popular in the UK in their damp, cooler climate. It might be a good winter crop in the southern US and can perennialize where the ground does not freeze.
It's interesting to hear others' experiences with different varieties in various locations. I've had best luck with the classic Scarlett Runner as well as Insuk's Wang Kong here in PA but both are pretty massive vines when mature.
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