I think, you should be carefully, oftenly, it depend on growing-conditions,
if you get all-green Heliamphora; e.g. at Kukenan- and Roraima-Tepui, I have
seen some all-green individuals of H. nutans, growing in 'weak' conditions,
I mean at places with few light and much humidity. The same plant will change
to read, if you put it into full sun and a substrate like peat. H. heterodoxa
is usually also in nature more green as the other ones, mostly you find
just a red rim and a red neck. Anyway, it would be nice, if they would be
realy anthocyan-free forms. Until now, I know just about an all-green
'H. ionasii' from Ilu-Tepui.
Thanks for information.
All the best
Joe N.
(sorry, I meant red, not read colour :-})
(The plants will not read anything)