Hi, I'm a beginner gardener and I've been watering my snap dragons every 2-3 days and they're in direct sunlight. I'm trying to figure out if they're just at the end of their life cycle or if I'm not watering them enough. Some of the petals are in full bloom and some petals are dried up. The stems are healthy and green though. I've attached a picture for review. Please let me know, thank you!