Introduction It is important to know that the Sativa and Indica plants are diurnal plants. This means that they use day/night light cycles to trigger their growth responses. For the outdoor farmer, they do not need to provide light for their plants because Mother Nature does it for them but for indoor farmers, they need to provide light for their plants on a daily basis. For the farmer, it is important that you understand they are two kinds of light phases especially for the indoor plants. ...