Concertina Plant
Crassula rupestrisUSDA | Grow Zone
9-11Outdoors all year in zones 9 to 11. Anywhere colder, keep it as a houseplant. Protect it below 40°F.
- Light
- Bright, indirect
- Water
- When the top 1-2 in is dry
- Humidity
- 30-50%
- Temperature
- 65-80°F (18-27°C)
- Difficulty
- Beginner
- Growth
- Slow
- Mature size
- Up to 1 ft tall
- Pets
- Non-toxic to pets
Crassula rupestris, commonly known as the Concertina Plant, is a charming succulent native to South Africa. Its unique, concertina-like leaves make it a popular choice for indoor gardens and succulent collections.
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Ideal temperature
50-80°F is where it grows fastest. Below 40°F cold damage starts.
Spacing and harvest
- Mature size
- Up to 1 ft tall
- Plant apart
- 12-24 in
- Frost
- Half hardy: light frost only
Everything it needs
9 essentials at a glance
Watering
Crassula rupestris prefers to dry out between waterings.
Water every 2-3 weeks during the growing season (spring and summer), allowing the top 1-2 inches of soil to dry out completely before re-watering. 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 leaf shriveling and browning.
Light
This plant thrives in bright, indirect light but can tolerate some direct sunlight.
Ideally, it should receive 4-6 hours of light daily. Avoid placing it in full shade, as this can lead to leggy growth and poor health.
Soil
Crassula rupestris prefers well-draining soil with a pH range of 6.0 to 7.0.
A cactus or succulent potting mix is recommended, or you can create your own by mixing regular potting soil with sand or perlite to enhance drainage.
Humidity
This succulent prefers low humidity levels, ideally around 30-50%.
To increase humidity, you can mist the plant occasionally or place it on a pebble tray with water. Signs of humidity stress include leaf curling and browning tips.
Temperature
Ideal temperature range for Crassula rupestris is 65-80°F (18-27°C).
It can tolerate temperatures as low as 50°F (10°C) but should be protected from frost. It is best suited for USDA hardiness zones 9-11.
Fertilizing
Use a balanced, diluted liquid fertilizer with an NPK ratio of 10-10-10 during the growing season, applying every 4-6 weeks.
In fall and winter, refrain from fertilizing. Signs of nutrient deficiency include stunted growth and pale leaves.
Pruning
Prune Crassula rupestris in spring to maintain its shape and remove any dead or damaged leaves.
Use clean, sharp scissors or pruning shears. Deadheading is not necessary, but removing spent leaves can improve appearance.
Repotting
Repot every 2-3 years or when the plant 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 water not absorbing properly. To repot, gently remove the plant from its pot, shake off excess soil, and place it in fresh potting mix.
Propagation
Propagation can be done through leaf cuttings or offsets.
For leaf cuttings, take a healthy leaf, let it dry for a few days to form a callus, then place it in well-draining soil. Water lightly until roots develop, which usually takes a few weeks. Offsets can be gently removed and planted directly into soil.
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.
Leggy growth
Why it happens
Insufficient light.
How to fix it
Move the plant to a brighter location to encourage compact growth.
Leaf drop
Why it happens
Sudden temperature changes or over-watering.
How to fix it
Maintain a stable environment and adjust watering habits.
Root rot
Why it happens
Poor drainage or over-watering.
How to fix it
Ensure the pot has drainage holes and allow the soil to dry out completely before watering again.
Pest infestations (mealybugs, aphids)
Why it happens
High humidity and poor air circulation.
How to fix it
Treat with insecticidal soap or neem oil, and improve air circulation.
Care through the year
Spring
In spring, increase watering frequency as the plant begins to actively grow. Fertilize every 4-6 weeks with a balanced fertilizer to encourage healthy growth.
Summer
During summer, ensure the plant receives plenty of bright light and maintain a consistent watering schedule, allowing the soil to dry out between waterings.
Fall
In fall, gradually reduce watering as the plant prepares for dormancy. Stop fertilizing to allow the plant to rest during the cooler months.
Winter
In winter, water sparingly, about once a month, and keep the plant in a warm location away from drafts. Avoid fertilizing during this period.
Toxicity & Safety
Crassula rupestris is considered non-toxic to pets and children. However, ingestion of large quantities may cause mild gastrointestinal upset.
Good to know
Why are my Crassula rupestris leaves turning yellow?
Yellow leaves on your Concertina Plant are often a sign of over-watering or insufficient light. Check your watering schedule and ensure the plant is receiving adequate light.
How often should I water my Crassula rupestris?
Water your Concertina Plant every 2-3 weeks during the growing season, allowing the soil to dry out completely between waterings. In winter, reduce watering to once a month.
What type of soil is best for Crassula rupestris?
Crassula rupestris prefers well-draining soil with a pH of 6.0 to 7.0. A cactus or succulent mix is ideal, or you can amend regular potting soil with sand or perlite.
Can I propagate my Crassula rupestris from leaves?
Yes, you can propagate Crassula rupestris from leaf cuttings. Allow the cut leaf to callus for a few days, then plant it in well-draining soil and water lightly until roots develop.
What pests should I watch for on my Crassula rupestris?
Common pests include mealybugs and aphids. Regularly check for signs of infestation and treat with insecticidal soap or neem oil if necessary.
What temperature is best for my Crassula rupestris?
Crassula rupestris thrives in temperatures between 65-80°F (18-27°C) and can tolerate as low as 50°F (10°C). Protect it from frost.
How do I know when to repot my Crassula rupestris?
Repot your Concertina Plant every 2-3 years or when you notice roots growing out of the drainage holes. Choose a pot that is 1-2 inches larger in diameter.
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