Light
Haworthias need less sun than echeverias or cacti, but they are not shade plants. Wisconsin Extension suggests an east or west window, where they get a few hours of direct light daily and bright indirect light the rest of the day. A south window works if a sheer curtain softens the midday sun, since direct sunlight can scorch the leaves, a problem NC State notes for the zebra plant. A north window, the University of Illinois Extension's medium light at the glass, keeps them alive but slows growth.
Color tells you how they feel. NC State says bright light brings out reds, oranges and browns in the leaves and gives the best patterns; in weak light, Wisconsin notes, the leaves stretch and lose their richness. Haworthias also grow very well under artificial light, and they fit neatly on a shelf under an LED fixture. Wisconsin points out they want more intensity than a standard fluorescent tube supplies, so keep the light close.
| Range | Low light to direct sun, best in bright light |
|---|---|
| Foot-candles | 75 to 1,500 fc (807 to 16,146 lux) |
| Windows | East, West, South, North · morning sun only |
| Sources | North Carolina Extension Gardener Plant Toolbox; Royal Horticultural Society; University of Wisconsin-Madison Extension; University of Illinois Extension |
Water
Water thoroughly, then let the mix dry before the next drink. NC State and the RHS agree on this; the RHS phrases it as watering only when the compost is approaching dryness. Wisconsin Extension says that in a well-drained mix haworthias can be watered weekly in the summer months, which shows how much a fast mix and warm weather change the picture. The finger test beats any schedule. When the top of the mix and the soil near the drainage hole are both dry, soak the pot and let it drain completely.
The danger zone is cool, wet and dim. Wisconsin lists prolonged wet soil, especially when it is cool, the light is low or the plant is not actively growing, as the cause of root rot, the most common problem with haworthias. The RHS asks for a winter rest with cooler conditions and only occasional, light watering, just enough to prevent leaf loss or shriveling. Kept warm and wet instead, the plant produces thin, weak growth that spoils its shape.
One quirk makes haworthias different from most succulents: their season varies by species. Wisconsin explains that some come from winter rainfall areas and grow in winter, others are summer growers, and many grow from late winter through spring. If your plant is pushing fresh leaves from the center in February, it is awake and can take a little more water than a dormant neighbor.
| Rule | When the mix is dry all the way down: let the mix dry out between waterings, then water thoroughly and drain |
|---|---|
| Winter | Give only occasional light waterings in winter, just enough to prevent shriveling or leaf loss (RHS); cool, wet soil is what causes root rot. |
| Watch for | Prolonged wet soil, especially when cool, dim or not growing, leads to root rot (Wisconsin Extension). |
| Some species grow in winter and others in summer, so watch for new leaves rather than the calendar. | |
| The RHS suggests rainwater or filtered water, as fluoride can damage the leaves. | |
| Sources | North Carolina Extension Gardener Plant Toolbox; Royal Horticultural Society; University of Wisconsin-Madison Extension |
Soil and pH
Mix a good commercial potting soil with an equal volume of drainage material, the Wisconsin recipe, using perlite, aquarium gravel, poultry grit or horticultural pumice. Wisconsin warns against sand, which is too fine and clogs the pores, and notes that a peat-based mix breaks down within a few years. The RHS simply recommends peat-free cactus compost. Terra cotta dries faster than glazed ceramic or plastic, and shallow pots generally suit haworthias better than deep ones, although a few species with heavy, thick roots appreciate extra depth.
| Mix | Equal parts good potting soil and coarse drainage material such as perlite, pumice or poultry grit, or a peat-free cactus compost; no fine sand. |
|---|---|
| Ingredients | potting soil or cactus mix, perlite or pumice, poultry grit or aquarium gravel |
| Sources | Royal Horticultural Society; University of Wisconsin-Madison Extension |
Humidity
No special humidity is needed. NC State describes average home humidity as adequate for the genus and says the zebra plant tolerates the levels typical of homes. That makes haworthias one of the few plants that thrive in a dry office. NC State suggests them for terrariums; pick an open one, since condensation in a sealed jar keeps the leaves wet.
Temperature
Keep haworthias above 50°F (10°C), the minimum given by the RHS, which lists 50 to 80°F (10 to 26°C) as their best range. NC State gives 60 to 80°F for the zebra plant and advises avoiding cold drafts and anything below 50°F. Wisconsin Extension is more generous: it says they do best at 75 to 90°F and tolerate the low 40s if the soil is not continuously wet. The sources disagree on the ideal, so we leave a single range out; above 50°F with dry roots, they are safe.
| Minimum | 50°F (10°C) |
|---|---|
| Humidity | Dry air is fine. Average home humidity is adequate, according to NC State; no misting needed. |
| Sources | North Carolina Extension Gardener Plant Toolbox; Royal Horticultural Society; University of Wisconsin-Madison Extension |
Fertilizer
Haworthias grow slowly and need little feeding. The RHS recommends a monthly feed for houseplant succulents during the growing season, April to September, with a high-potassium or specialist cactus liquid feed. The University of Illinois Extension's general houseplant ceiling, once every 1 to 3 months from March to September at the label rate, suits most windowsill plants. Skip feeding in winter, when the plant rests and unused salts accumulate.
| When | Spring and summer, April to September at most, every 4 to 13 weeks, none in winter |
|---|---|
| What | Liquid cactus feed or a high-potassium liquid fertilizer at the label rate, label rate |
| Sources | University of Illinois Extension; Royal Horticultural Society |
Work out the dose for your watering can with the fertilizer dilution calculator →
Repotting
Haworthias can sit in one pot for years, which is exactly why they get forgotten. Wisconsin Extension recommends repotting into fresh soil every 2 to 3 years, because old mix decomposes and stays wet. Choose a pot about the same volume as the root system rather than a big one the plant is expected to grow into, and if roots were lost, water sparingly until new ones form. The RHS advises spring as the best time and warns that excess compost stays wet and causes rot.
- Offsets have filled the pot surface edge to edge
- The mix has gone dense and stays wet, or two to three years have passed
- Growth stops and leaves shrink, which can mean a weak root system