Hi my callas just started to bloom, they are the white albo maculato and I really need to hold them off for about 4 1/2 weeks. I have lowered the temperature in the greenhouse to stay between 60-65 degrees day time and 50-55 degrees F night. Is there anything else I can do to hold them off for a few more weeks? Oh and how long can I expect them to bloom for. I also have some crystal blush and Lilac mist but they have not begun to send up flower stalks yet.

Thanks all

Amanda