alan.holmes writes
Each morning I go to the bottom of the garden to pick runner beans, and
often I cannot find any, then a couple of days later there are dozens of
them, huge and well past their best, so where have they been hiding, and how
can I be sure to find the damnned things before they get to the stage when
they are inedible?

If you shake the plants, the heavy beans have a different movement from
the leaves and are easier to spot.
--
Kay