Try digging one up to see where it's at. Many possibilities as why they haven't grown. Try starting them inside in peat pots them plant them out after they've grown on a bit.

Hi Alanjohn, where are you on the planet? It does make a difference!

Have you had enough rain?
(Like your new avatar MG!)

Thx. Stera!

welcome GoY.
they may have been eaten by mice too.
I grow mine in pots in multipurpose compost. sowing them in April in the greenhouse and then they are hardened off in early May and planted out late May.

You need lots of water, also patience. Might just need a little longer.

If you live, for example, in the north of Scotland growing runner beans outdoors is impossible French, climbing, beans are fine but not runners - hence I asked you where you live Alan.