sure it works, it works best if you cut the plant back. prune the root mass and re-pot. veg it under 24 hour lights til the new growth leaves are for sure going back to 5 tipped leaves, then its ready to go to 18/6. but... it still takes so much longer than cloning the original plant while it was in veg and making a mother/clones. and the re-vegged plant never seems to yield like it did the 1st time.