Grow earth stars in a bright spot. These small indoor plants can take some direct sun on their leaves, so they're perfect for dressing up an otherwise bland window sill. As a general rule, the brighter the light, the more colorful the plants are. If your earth stars seem pale, move them to a brighter spot and they should start to show more intense shades. Water earth stars so the soil just dries before watering again. They don't seem to be particularly fussy, however and will thrive in moist soil. Likewise, if you forget to water your earth stars now and again, they don't mind. These unusual houseplants like average to high humidity. Earth stars don't require a lot of fertilizer. If you do wish to feed them, use a general-purpose houseplant fertilizer and follow the directions on the packaging.