Add lighting to come on in the morning. They need about 14 hours of light in a day, 16 hours for maximum production. You have to figure out how much natural light they are getting then I find it easiest to put the light on a timer to add the extra. Personally I only give mine 14 hours. If I normally get 12 during the summer they might slack off to 9 or 10. I'm not exactly worried about full production.