Haworthias don’t like strong and direct sunlight. In the native habitats, they mostly are found growing in the filtered shade of rocks, shrubs and bushes. Shade cloth can be used to diffuse sunlight and reduce its strength. A white one On the other hand, if the light is too weak, Haworthia will stretch. Grow lights can be used for compensating insufficient natural light.
Below is a brief summary of the ideal light strengths for some common species. Some individuals, especially the variegated ones, are more sensitive to strong lights and their leaves turn to red or even black. Move them to a more shaded place and they will recover gradually.
|H. emelyae var. emelyae|
H. mirabilis var. splendens
|H. truncata var. truncata|
H. truncata var. maughanii
H. emelyae var. comptoniana
* For a plant that has well-established roots, the strength can go up to 10,000 lx.
A Haworthia will lean into the direction of the strongest light, in an effort to reduce the stem surface area exposed to direct sunlight. This process for Haworthia is generally much slower than ones for other succulents. But if a plant keeps receiving stronger light from one fixed side, it will have a visible twist of the shape. Taller species like H. attenuata are more prone to lean.