Although the nightly temperatures vary depending on where you live, many succulent species have learned to adapt to extremes of both the cold and the heat. Echeveria sp. peacockii: This echeveria species doesn't need watering as often and occupies less space. This cactus grows slowly so it won't need to be repotted often. Bright yellow flowers emerge from the star-cactus during spring. Once mature, the star cactus produces beautiful yellow flowers at the top. It adds height and beauty to any design. Reason 4 - When the plant is not adequately fed.