Mysteries.

Planted as seeds.
Great growth.
Produced heaps of peas.

BUT

Suddenly started to die off slowly from the bottom up. From the looks of it I'd swear it was under watered but being where the planter is, it's a battle to keep it from being water logged after a light watering.

Confusingly all three plants have since sent out new shoots that are once again producing lots of peas.