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As long as it's been kept dry it's probably fine. Whether you want to use it is up to you really. Clearly it won't help any aim you may have to be organic.
I'm sure you could palm it off to some allotment old timer if you didn't want to use it.
We have some chicken manure pellets which came with the house. It's a big tub and 6 years on we're still scattering them around.
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chicken manure pellets
There's a tub of that as well. Maybe I'll just keep that to use and try and give away the fertiliser. Aside from supporting a systemically unsustainable industry what are the cons of actually using chemical fertiliser on your own patch? We're not near any water-courses so not much risk of it washing out.
Found a 10kg tub of fertiliser, several years old. It's Westland Growmore - balanced NPK granules, chemical-based. We generally aren't using chemicals in the garden and trying to keep it fairly wildlife friendly, so not sure if we should use this, or try to freecycle it (initial thoughts are not to use it). However - could it be useful? We have been growing veggies for a few years, no major input of externally sourced manure or other conditioners, only a bit of compost (both bought and home-made). Have only just discovered the joys of mulch (bark and straw) which has been a bit of a revelation.
Does fertiliser go 'off'? It's probably around 10 years old, maybe more.
Is it related to the WWII "National Growmore" fertiliser?