Personally, despite all the colonization seen in space operas, I would be surprised if anything that arose on one planet would grow on another, including human beings. After all those millenia, our relatively close relations, the Voth, were still living on ships. I think this was an accurate portrayal of what would be necessary.
There wouldn't be the correct nutrients and elements in neither the soil nor the atmosphere to sustain earth organisms long term, nor the proscribed seasons and sunlight. The only reason we have a fairly stable climate is that we have a good moon.
No moon, and your planet wobbles wildly, creating havoc in your seasons. Also, higher organisms depend on micro-organisms that would not be supported by an alien environment -- which might in fact contain detrimental factors, not just neutral ones.
Living on ships is a good idea; and I always thought it right that the VOY crew felt at home on theirs.