definitely I agree flush and use the grow nutes, if its in doors I would use your HPS light for 24 hours on it (MH are a waste it is turning out), and then take clones off of the new growth and use those for mothers or mother. but either way sounds like the plant is alive and on its way good luck. if you have any root stimulator I would use that if not it is ok, but even some super thrive would do some good in their.