Name: Susan Virginia (Zone 8a) God is the only thing that matters.
It could be the soil. I have seen pictures of the spaces between veins and it is a mineral deficiency. Would not hurt to have soil tested.
Consider the lilies of the field, how they grow; they toil not, neither do they spin: And yet I say unto you, That even Solomon in all his glory was not arrayed like one of these. Mat.6:28-29