Perlite and pumice can transform subpar soil into a succulent-friendly substrate. I will always support the local nurserymen and small businesses before I shop at Home Depot. To add some brightness to your garden or home, you can start collecting yellow plants. While it may not look this way at first, light competition can be a problem for any terraria (even those that aren't so successful) and is something that will eventually lead to a decline in their growth. This lack of light encourages the plants to flower, especially in autumn.