Purple Hull Peas not purple
My question is whether the cause is environmental or did I end up with genetic throwback peas.
I purchased Purple hull seeds several years ago and have been saving pods to plant the next year. I have not planted any other pea(bean). This year most of the pods never turn purple - most just turn yellow, or yellow with a slight purple blush and the beans are green or cream color with very little eye. Some are crowders and others are not. The few that do turn purple have pinkish brown beans with a pronounced eye. The plants with purple pods were planted and all the others are volunteers from pods that were tossed on the ground last year ( because the didn't turn, or dried on the plant). The true purple hulls are in a new section of the garden so the soil conditions are different.
Do I have a nutrient deficiency or are the volunteers crossbreeds/genetic throwbacks?