It is a very interesting question I must agree - although, I'm not sure if it would be something that is possible; Plants need a place to feed, breathe, and to gain some form of nutrition. Just - as any living-being would also require.
Without a gravitation to keep this nutrition in place; It would be mere chaos and almost uninhabitable - unless, of course, there is SOME kind of nutrition that is alike to our Sun and gives a water source to keep the plants alive.
- I don't believe it is possible to do so, then again, this is only my hypothesis.