Haworthiopsis coarctata
Haworthiopsis coarctata
Haworthiopsis coarctata, commonly known as the star window plant, is a charming succulent native to South Africa. Its striking rosettes and easy care make it a popular choice for indoor gardening enthusiasts.
Everything it needs
9 essentials at a glance
Watering
Haworthiopsis coarctata prefers to dry out between waterings.
Water every 2-3 weeks during the growing season (spring and summer), using enough water to soak the soil thoroughly but allowing excess to drain out. In fall and winter, reduce watering to once a month. Signs of over-watering include yellowing leaves and mushy stems, while under-watering may cause shriveling and browning leaf tips.
Light
This plant thrives in bright, indirect light but can tolerate some direct sunlight.
Ideally, place it near a window where it receives 6-8 hours of light daily. It can adapt to lower light conditions but may grow more slowly and lose its compact form.
Soil
Haworthiopsis coarctata prefers a well-draining soil mix, ideally a cactus or succulent potting mix with added perlite or sand for improved drainage.
The pH should be slightly acidic to neutral, around 6.0 to 7.0. Ensure the pot has drainage holes to prevent water accumulation.
Humidity
This succulent prefers low humidity levels, ideally around 30-50%.
To increase humidity, you can mist the plant lightly or place a humidity tray nearby. Signs of low humidity stress include leaf curling or browning edges, while excessive humidity may lead to rot.
Temperature
Haworthiopsis coarctata thrives in temperatures between 65-80°F (18-27°C) and is hardy in zones 10-11.
It can tolerate brief temperature drops to 50°F (10°C) but should be protected from frost and extreme heat, which can damage the plant.
Fertilizing
Use a balanced, diluted liquid fertilizer with an NPK ratio of 10-10-10 or a cactus-specific fertilizer.
Fertilize every 4-6 weeks during the growing season and refrain from fertilizing in fall and winter. Signs of nutrient deficiency include stunted growth and pale leaves.
Pruning
Pruning is generally not necessary for Haworthiopsis coarctata, but you can remove any dead or damaged leaves at any time.
Use clean, sharp scissors or pruning shears to prevent disease. If the plant becomes leggy, you can trim back the stems to encourage a fuller shape.
Repotting
Repot Haworthiopsis coarctata every 2-3 years or when it outgrows its pot.
Choose a pot that is 1-2 inches larger in diameter. Signs it needs repotting include roots growing out of the drainage holes or stunted growth. To repot, gently remove the plant from its pot, shake off excess soil, and place it in fresh soil in the new pot.
Propagation
The best propagation method for Haworthiopsis coarctata is through offsets or leaf cuttings.
For offsets, gently remove the pups from the base of the plant, let them dry for a few days, then plant them in a well-draining mix. For leaf cuttings, allow the cut end to callous for a few days before planting. The best time to propagate is in spring or early summer.
When it's unhappy
Yellow leaves
Why it happens
Over-watering or insufficient light.
How to fix it
Reduce watering frequency and ensure the plant receives adequate light.
Shriveling leaves
Why it happens
Under-watering or low humidity.
How to fix it
Increase watering frequency and consider misting the plant or using a humidity tray.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a brighter location to encourage compact growth.
Root rot
Why it happens
Poor drainage or over-watering.
How to fix it
Ensure the pot has drainage holes, reduce watering, and consider repotting in fresh, dry soil.
Brown leaf tips
Why it happens
Under-watering or low humidity.
How to fix it
Increase watering and humidity levels to prevent further damage.
Care through the year
Spring
Increase watering as the plant begins to actively grow, and consider fertilizing every 4-6 weeks.
Summer
Ensure the plant receives adequate light and water regularly, allowing the soil to dry out between waterings.
Fall
Reduce watering frequency as the plant enters dormancy, and stop fertilizing until spring.
Winter
Water minimally, about once a month, and keep the plant in a warm location away from cold drafts.
Toxicity & Safety
Haworthiopsis coarctata is non-toxic to pets and children. It is safe to have around, but ingestion of large quantities may cause mild gastrointestinal upset.
Good to know
How often should I water my Haworthiopsis coarctata?
Water every 2-3 weeks during the growing season, allowing the soil to dry out completely between waterings.
What light conditions are best for Haworthiopsis coarctata?
This plant prefers bright, indirect light but can tolerate some direct sunlight. Aim for 6-8 hours of light daily.
Why are my Haworthiopsis coarctata leaves turning yellow?
Yellow leaves are often a sign of over-watering or insufficient light. Adjust your watering schedule and ensure adequate light exposure.
Can I propagate Haworthiopsis coarctata from leaves?
Yes, you can propagate from leaf cuttings. Allow the cut end to callous for a few days before planting in well-draining soil.
What type of soil is best for Haworthiopsis coarctata?
A well-draining cactus or succulent mix is ideal, with added perlite or sand to enhance drainage.
What temperature range is suitable for Haworthiopsis coarctata?
This plant thrives in temperatures between 65-80°F (18-27°C) and should be protected from frost.
How do I know when to repot my Haworthiopsis coarctata?
Repot when you see roots growing out of the drainage holes or if the plant shows signs of stunted growth.
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