I've got 4 avocado trees, I'm struggling with one. Is there a specific fertilizer to use for them all? As well I should inform u they are in pots, we bring them in in the cold months, the one I'm struggling with I thought was dying, top became black & loosing branches, I cut the black ( trimmed) off, some branches are growing back, seemed droopy thus morning. Very expensive tree to lose it
When fertilizing potted trees, make sure you feed correctly and do not over apply. Excess fertilizer can build up in the soils over time and can harm the plants.
Blackening leaves is a sign of salts high in soils. Watering with conditioned water also can cause this. Distilled water or water that sets out for 48 hours will work.