Earlier last year, I posted that my oleanders were not growing and needed to be water twice a week in order to not droop. I attributed this to two things, the gray brick wall behind them reflecting heat and a large tree adjacent to them absorbing a lot of the water.
To encourage growth, about two weeks ago, while dormant, I pruned off about 1/2 of the tops hoping it would encourage root growth and new top growth in summer. Now they're looking sickly.
I noticed two of my photinias which are in direct sunlight have yellowing leaves with green veins, which means iron deficiency. Do you suppose this could be the issue with Nerium too?