Keep terrariums in the bright spot in your house. They love a indirect sunny window sill, and also thrive under bright artificial light, making them ideal accents for your desk at work or school. Outdoors most terrariums like indirect light as well. Because succulents store water in their leaves, they don't need to be watered very frequently. Once every couple of weeks -- or less -- may suffice, depending on the variety, the size of the container, soil dryness and the amount of light and temperature it gets. Most succulents are pretty slow growing, so you typically don't need to worry about pruning them. Just remove the leaves that have fallen to avoid rotting. You can fertilize succulents if you want for faster growth with any general-purpose fertilizer. Note: While they're beautiful and easy-care plants, succulents are not intended for human or animal consumption.