Quote Originally Posted by Fax Celestis View Post
Cast genesis into the bag of holding?
Quote Originally Posted by D20 SRD
This spell cannot create life (including vegetation)
A Bag of Holding already IS a demiplane, so all genesis would do would be to possibly enlarge it. Also, you will need a source of energy for the plants. The daylight spell might do so, though since it doesn't affect Vampires and creatures with similar weaknesses, it is debatable. Still, if I was DM, I would allow it.
I think there is an item that provides fresh air though, so just sticking one of those in their would probably be easier.