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variegated rubber tree getting large dark spots on leaves

3 years ago

my variegated rubber tree is growing new leaves after a dormant winter, but it’s also started getting large brown spots on its existing leaves! i can’t figure out what they are. some are dry, others are soft and leathery, and others are rough like sandpaper. does anyone know what might be happening here?

i’ve potted it in a well draining mix and am watering well weekly. the worst spots appeared after i started fertilizing with dyna-gro foliage pro 9-3-6, so i ceased fertilizing but it hasn’t gotten better.

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