Thanks, Bettynh. Looks similar in tomatoes. In later stages, the bottom leaves yellow and die.

Apparently certain fruit-bearing plants (such as tomatoes, raspberries and blackberries, and apple trees) are especially sensitive to magnesium deficiencies. Seems that tomatoes are sensitive to a bunch of deficiencies. I had trouble with blossom-end rot for years. A local organic market gardener told me that the ph of our local soils makes it difficult for tomatoes to take up calcium, and told me to mix in a full cup of bone meal in the soil below the planting hole when I set out tomatoes. I took his advice, and have not had problems with blossom-end rot since then.

Talking about ph, I assumed the soil here is acid, as that is the norm in this region, and lordy knows I have bunches and bunches of oak trees and leaves, which I understood, perhaps incorrectly to contribute to acidity. The azaleas seem to do well enough, though I use an acid fertilizer around them. However, the soil is very rocky, and the rock is feldspar, some strains of which contribute to alkaline soil. (I can't find information about the local feldspar, at least not written so that I can understand it.) I noted in another post that some of the blooms on the mophead hydrangea I brought with me are pink and some are blue, a few are violet, and a few are mixed -and all are staying those ways as the colors deepen. both colors appear on both hemispheres of the shrub, but blue dominates on one side, and pink on the other. I speculate the over-all ph of the soil here is probably neutral, with micro-patches of higher and lower ph, and that where I have the macrophylla planted there is significant variation. I would think that if the soil was uniformly neutral where the root system is distributed, the variation in color would be equally distributed on the plant.

Opinions?   

Guess a soil test might be a good idea, eh?