The potassium nitrate in the real black powder IS good fertilizer, unlike the usual recommendation for discarding smokeless.
I don't think the potassium chlorate in Pyrodex will do the garden any good. I'd sprinkle it in the gutter and dissolve it down the storm drain.
But it seems a shame to just throw it away; as said, black doesn't degrade.
Don't you have any muzzleloading or BPCR friends?
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