Is there any use for coffee beans in the garden?

[ErrolTheDragon]

DH has just unearthed a couple of bags of out of date coffee beans of a type we're not keen on anyway. Before I bin them, it occurred to me they might have some horticultural use. Any ideas?

Slug deterrent

Ground presumably?

I use spent coffee grounds to stop squirrels digging in my pots!

It is the caffeine which deters slugs in coffee - so if you grind them and scatter without making any coffee first it might work as a deterrent.

Alternatively just grind them and Chuck them either in your compost bin, or if you don't have one scatter them generally and they will not harm the soil but will add to the biomass as ground they'll degrade fairly quickly.

Don't throw them away!

This is whole, unused beans.
So perhaps I'd better keep them - I don't seem to have much of a slug problem at the moment, surprisingly enough, none of my sunflowers got chomped and my hosta is whole!