I've gotten really curious about the green bismarckia. Unfortunately, I've never gotten consistent answers on the whole green versus silver debate.
Version 1 of the story says they are just as hardy and grow under the same conditions as the silver form, see http://www.rarepalmseeds.com/pix/BisGre.shtml. Ed Brown in Jacksonville Florida reports that the green ones have far outperform the blue one in terms of hardiness (See post #9 here:) The green one is much, much more common in Antanarivo where temps are quite cool compared to the silver bismarckia habitat, and there are many quite tall and large green bismarckia all over Antanarivo. Some have suggested that because of the lack of wax, the green one is much more efficient at photosynthesis and happens to grow faster and better in cooler climates. Even Jeff Marcus reports that the green one is far easier to grow on the humid Hilo side of the big Island because the seedlings have much more fungal resistance.
Version 2 of the story says the green ones are much, much more tender than the blue ones and happen to be slower and more tropical in their requirements. Some sort of green form made the rounds in Southern California and failed, so people here have pretty much given up on them.
I realize that the blue one is far more desirable from an aesthetic point of view, but if I can find the green type that fits under version 1, it would actually be a better choice for a more heat deprived USDA 10a for someone who would like a ginormous palm. I am never gonna find out unless I play around a bit. I ordered a bunch of bismarckia seeds, the green form and the blue form. I have the green and blue ones in exactly the same conditions, at around 27C. Lo and behold, the green ones took 2 weeks to germinate, and the blue ones are still sitting there doing nothing. So far the only other germinators are livistona muelleri and archont. purpurea.
Anyone else played around with the green ones?