how long are nutrients good for?

[CINDARELLA99]

I have some nutes left over from a grow I stopped in summertime. Extreme serene and some other roots organics stuff. No expiration date on bottles. Bought around January of this year

 

[Slowitdown]

There is no way to really tell. Did you leave it out in hot weather? That will speed up the process of ruining the nutes... Also, take a look at them. Are they gunky, smell different, ph off on them? All these are factors.

 

[Seamaiden]

It depends on what they're made from, really. I have bottles of chemical salt-based nutrients that have been in my basement (cool temps, no huge swings in temps or RH) for a couple of years now, and they're fine. I have some organic stuff that develops a weird crust if it's left to sit.