Anyone know what this is?

Closest I can find is powdery mildew but that doesn't seem the same. It almost looks like water that's dried on the leaf and left some salt crystals, there's some on the soil underneath aswell

Maybe you spilled alittle nutrient water on it

That's what it will be it was on a plant at the back of my tent and I lean in to feed it. Thanks

Bazza1985 said:

That's what it will be it was on a plant at the back of my tent and I lean in to feed it. Thanks

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What nutes? Thats crazy salts build up if that was just a splash.