Hey all! I hope you've had a great start to the Spring season so far!

I've had a bottle of 12-4-8 Miracle Gro liquid fert for about three years. I'm not sure if I should continue using it (should finish it this summer) or buy a new one. Do liquid fertilizers expire or degrade in a way that is noticeable? Would it affect my plants negatively in any way?

I also have a few plants that I suspect are quite nutrient deficient (probably haven't been fed in a year) and I'm planning to use the bottle to give them some needed nutrients. Will this bottle be fine or would it be better to get a fresh bottle?

I've kept the bottle below a small table where it gets a little sun each day. Temps where it's stored range from 67*F to 72*F. Humidity is around 30%. The cap is screwed on relatively tightly.

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An additional note-would liquid fertilizer remain effective if I mixed up a couple batches and kept them stored somewhere (e.g. water mixed with the appropriate amount of fert in a gallon bottle, then stored (not used immediately))?

Many thanks!