Answer: Oleander thrives when given full sunshine and little water. I don't know how much you water but I suspect your plant is getting far too much water, which is stressful at best, and could lead to root rot disease. The browning leaves might even be a symptom of too much water coupled with general transplanting stress. You can prune oleander back at any time of the year. I wait until it has finished flowering and then prune it back to encourage a thick, dense looking shrub and also to keep it under control. I remove a few inches all over the plant and occasionally prune out some of the branches in the middle to force new shoots and new leaves in the center and lower down on the plant. Otherwise you'll end up with a leggy oleander with foliage only at the top and the ends of the branches. About one inch of water per week is all your oleander needs. Apply deeply and slowly to encourage deep root growth. Hope this information is helpful!
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