I started my AA tubers (dinner plate) in the house under grow lights (14hrs a day) the second week of March and did not plant outside until mid-June (because we had a cool spring) and I still do not have flowers only small buds. The plants are in full sun. Reading other postings, it is claimed they take 90-120 days from planting to bloom. Why do you think mine are taking so long? They have been regularly fertilized with a low nitrogen fertilizer. Any suggestions would be greatly appreciated we can have frost as early as the beginning of September so I need to have my dahlias bloom earlier.