This situation occurs when the rose stem remains vegetative and grows leaves instead of flowers. More light intensity helps with this problem. When temperature and light intensity are increased, this problem diminishes, down to 15%. Otherwise it is up to 40%.
While higher temperatures help, if it is hotter than 21 degrees, the problem starts happening again. Also, the difference in temperature in day and night should be kept to a minimum.
Bad trimming also adds to blind shooting too.