Fuschias are seasonal plants originally from southern Chile and have a growth season, spring; a flowering season, summer and fall, and a rest season, winter. Even if you keep your plants in a greenhouse you should respect this cycle. Your details dont state where you are from, so my general advice would be, keep your plant(s) out of doors, well-watered and in half-shade as long as possible. They enjoy fresh air (reduces pests) and definitely don't like high summer temperatures. Only bring your plants into the greenhouse when there is a threat of frost. Despite this keep winter temperatures low without freezing, reduce watering. Prune hard end of fall. Hope this helps.