Runner beans are my favourite veg, but has to be picked early before they get too long or swell with beans, I've never found anything in the shops coming anywhere near the quality you can achieve in your garden.
And if you keep up the picking whilst small, they keep on producing, some years right into November.
These are grown in a raised bed climbing up canes slopped against an east facing fence.

Developing bean pods.

First crop, no strings guaranteed.

