Sorcha, where'd you see 'siver'? (silver?) Anyway, the Welsh 'gwyn' would mean 'white' which, in this case, refers to the grain being ripe. I suppose when you're preparing singable translations, you adapt the native idiom. In English I guess this would be 'golden' although I can see where poetic license would embrace 'silver' ...

I just added some thoughts to the other thread to which Masato refers, above ...

sian