Yeah, too much water. I take mine out every spring, and bring it in every fall before the frost. It buds every year, and when I have to bring it in, the buds fall off. This year, it is blooming!!!! Inside!!! It is a double flower, and some of the blooms are a very pale pink, white almost, and the others are a salmon color. It has been so long since it bloomed, it forgot what color it was supposed to be. And it must be a Halloween cactus, because it's not Thanksgiving or Christmas yet... poor thing is blooming while it can!!