When it s time to water your seedlings, it s best to do so early in the morning or just before you switch on your grow lights. What are the best conditions for seedlings When can seedlings be put under lights or in the sun The Life cycle of Cannabis from seed to harvest With best wishes, Mark. When they harvest one plant they can add another seed to their grow room and leave the plants under the same light cycle 20 hours of daily light whether they are seedlings or approaching harvest.  Source: <a href="http://hhmceducampus.com/dark-vs-white-cannabis-seeds-germination-video/" / rel="nofollow">http://hhmceducampus.com/dark-vs-white-cannabis-seeds-germination-video/</a>