GREEN HONEY
One plant which has a tendency to produce nectar which results in green
honey is Purple Loosestrife (Lythrum salicaria L. (Lythraceae)). It
grows in damp areas, along roadside ditches, etc. and is a great nectar
producer. Greenish coloured honeys are quite well-known, but I don't
know of a list of honey-plants and the colour honey they produce.
 
Cheers, Peter