> I have Marathon fertilizer. It comes in little white pebbles. I'm not sure
> if others do too, I've never used anything else.
>
> It ended up turning from pebbles to a powder form. I assume it's from the
> heat. My garage has been near 100 degrees for a couple weeks.
>
> Besides changing forms, and not working appropriately in my fertilizer hand
> held sprayer since it's a powder, is it still any good?
That would depend a great deal on the chemical composition of the fertilizer; but, it's an odds-on bet the answer is 'no'. Call Marathon -- the phone number will be on the fertilizer packaging
-- and ask.
Chris Owens