Short day processing

I bought a poinsettia last year. The withered green leaves have recovered a lot, so I decided to do a short-day treatment! It seems that green leaves turn red when short-day treatment is applied, so this is my first attempt. The way to do it is to block the light with cardboard etc. from 5:00 pm to 8:00 am. If you do this for about 3 months, the green leaves will turn red! A cardboard box containing six 2-liter plastic bottles is just the right size! 😃✨