Once your etiolated rosette is back outside and had a few weeks to recover and build strength, you can cut the top off with about 1/2" worth of stem, dry a few days and plant. The top will produce roots and begin growing more normally. The bottom, rooted stem should also go on to produce new growth points that will develop into new rosettes. Once etiolated, the rosette will never look like a normal one, but will recover somewhat. Why not use the etiolation to generate more plants and practice surgical skills?
