For the most of the roses, 16 degrees of night temperature is ideal. For the sunny days, it’s suitable if the temperature is 5-7 degrees higher than this inside the greenhouse. In higher temperatures, while the roses grow faster, the quality of production is lower. It is very important to control the temperature for the newly planted roses.
Especially during the period called “The Critical Duration”, until the rosebud is as big as a pea, the temperature should be maintained around 21 degrees, after that period, it can be lowered to 16 degrees. It’s been proven that this hastens the flowering process.