37d IO'd never heard of 'fog' being a type of grass either. All done ... except perhaps someone can help explain what seems to be the answer to 55a ELECTRON GUN (I presume there is such a thing) - but then my answer to 47d "Fertiliser in container for plants, timber" wants to be POTASH - but then that messes up the "electron" bit. Can anybody put me out of my misery - without sending me out to mow the lawn, or (worse) turning an electron gun on me.