Nirvana's range of marijuana seeds for indoor growing have been developed to flourish in artificial or semi-artificial environments, often called grow rooms. In a grow room, all the elements necessary for growth must be reproduced: light, soil (or another medium), water, wind, heat, humidity.
In general, indoor marijuana seeds result in more compact cannabis plants which love stable temperatures. For these reasons they can be grown outdoors only where and when the conditions are similar to those of a grow room, for example, a Mediterranean country between April and October.