I have some "grow big". Been sitting for a couple years and some of it has crystalized. Is it still good?

If it's been open for over two years and has any kind of organic compounds in it.. toss it.

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Its ben closed up tight. No organics in it. Smells fine, looks fine. Just that some of the liquid has crystalized. I emailed FF direct but they never answered me?

I've seen that happen to Grow Big after just 6 months. I would dump it. Of course mine had been opened and used regularly and not uncommon for me to dump it at the first sign of solid matter in the bottom.

I believe (though no expert) that a lot of salt would accumulate in the crystals.