Kalanchoe Humilis is large succulent shrub. It is easily identifiable by its distinct and striking features. It is a good choice for arrangement, but it will grow very large if not trimmed regularly. Rebutia heliosa grows in tight clumps and is a slow growing cactus. You can also create a system of fibrous roots that extend laterally from the cactus plant, allowing it to absorb as much water as it can when it rains. A grow light can help your plant thrive. It will still be able produce chlorophyll without too much sunlight.