Gasterias, also called forest oxtongues, are aloe lookalikes and therefore are mostly native to the warmer regions of South Africa. More especially, they can be found at the Eastern Cape, in which they grow in dry thickets or cling precariously into a stone face.
The leaves are thick and long with a rough texture, and often marked with intriguing patterns and colors. Edible, tubular flowers on slender stems appear from winter to spring up and are very full of nectar.
Gasterias tolerate much lower lighting conditions than a number of other succulents and are thus perfect to grow indoors away from direct sun, but still in bright light. They also enjoy an increasing medium enriched with organic matter, therefore add some compost into a succulent potting medium.
Make sure they enjoy superb drainage, and water only when the soil feels dry, trying your best not to get water on their leaves.