Can you over fertilize a plant and if so is it fixable?
Answers: Yes. If it's an indoor plant, the easiest item to do is repot. For an outdoor plant like your blackberry, apply copious amounts of marine.
Yes you can over fertilize a plant. Yes it is fixable.
Best thing to give support to over fertilization of plants is to use water to run out the extra fertilizer. If it is a fertilizer stick, remove the stick! Another item to use would be a slightly acidic mixture next to water to dilute some of the nitrogen contained by the soil.
If you over-fertilized it, the plant could die. Try to transfer the plant surrounded by another place that is not fertilized if its not too tardy. It also depends on what type of fertilizer you used.
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