dont know about the dormant thing but he can reveg them, just throw them back in an 18/6 light. i've never done myself and i've been told that the plant doesn't come back as good but it does work. why go to the bother? throw some seed in a pot , if your gaunna wait 4 months anyway why take the chance. and next time just take clones. as for having plants for years thats quite common, people use mother plants under 18/6 for long periods of time just taking clones from them