Sorry, I can not type chinese now & H6 b2 @5 @. h2 M0 B: x 6 {8 k3 T* s4 U8 O& s3 SBut, I put the poinsettia in a seperate room which should have more than 10hrs black time. Maybe it need more sun light?
at least 10hrs darkness, you can treat it 10~14hrs or longer ,it does not a matter, just a couple of hrs of sun light. and hopefully it can change corlor 3 weeks later till x-mas day.