2 have stretched alot and 2 stretched very little.i would say it has to do with lighting and how far away I had them from the lights.its alot better when you can adjust the brightness.
@MrStickyscissors75,no.they grew well for a how low my r.h was in the winter. I imagine they would do really good with proper.r.h.i had a few different pheonos.2 are straight purple and 2 don't have much purple and they have a tighter structure.both are pretty nice looking