The Calathea Silver, known scientifically as Calathea setosa ‘Grey Star’ or Calathea roseopicta ‘Silver Plate’, is a captivating houseplant celebrated for its striking foliage. It features glossy, silvery-green leaves with darker green veins and a vibrant purple underside, making it a popular choice for indoor plant enthusiasts.
Understanding Calathea Silver
The Calathea Silver, a member of the Marantaceae family, is known for its intricate leaf patterns and contrasting colors. Its greenish-grey or silvery upper leaf surface, sometimes with a subtle pink blush in younger leaves, complements a rich purple underside. Fine hairs on the stems add to its unique texture. This plant exhibits nyctinasty, often called the “prayer plant” habit, where leaves fold upwards at night and unfurl during the day in response to light cycles.
Calathea Silver Care
Light Needs
Calathea Silver thrives in bright, indirect light, similar to its natural jungle habitat. Direct sunlight can scorch its delicate leaves, causing them to fade, curl, or develop brown edges. Excessive light also leads to fading leaf patterns or burnt spots, while insufficient light can result in dull foliage and hindered growth.
Watering Practices
Consistent moisture is important for Calathea Silver, but avoid waterlogging the soil. The soil should remain evenly moist, allowing the top inch or two to dry slightly between waterings. Overwatering can lead to root rot, while underwatering can cause leaves to curl inward and turn brown. Calatheas are sensitive to minerals like chlorine and fluoride often found in tap water, which can cause browning leaf tips and edges. Using filtered, distilled, or rainwater is beneficial, or tap water can be left out overnight to allow some chemicals to dissipate.
Humidity Requirements
High humidity is crucial for Calathea Silver, ideally ranging between 50% and 70%. Low humidity is a common cause of brown and crispy leaf edges. To increase humidity, place the plant on a pebble tray filled with water, use a humidifier, or group plants together. Misting the leaves can offer a temporary boost in humidity.
Soil and Potting
A well-draining yet moisture-retentive potting mix is ideal for Calathea Silver. A blend of peat moss, perlite, and bark ensures good aeration and drainage to prevent root rot. Adequate drainage holes in the pot are essential to prevent water accumulation. Repotting is typically needed every few years, preferably during spring or early summer, when roots begin to fill the current container.
Temperature Considerations
Calathea Silver prefers warm and stable temperatures, ideally between 60°F and 85°F (15°C to 29°C). Temperatures below 55-60°F (13-15°C) can cause stress, leading to leaf curling and potential damage. Protect the plant from cold drafts and extreme temperature fluctuations, such as those near open windows, heating vents, or air conditioners.
Fertilizing
During spring and summer, Calathea Silver benefits from regular fertilization. A balanced, water-soluble houseplant fertilizer diluted to half strength applied monthly is recommended. Fertilization should be reduced or stopped during the fall and winter months when the plant’s growth naturally slows. Excessive fertilizer can lead to leaf burn.
Troubleshooting Common Issues
Browning leaf tips and edges often indicate low humidity or sensitivity to tap water minerals. Curling leaves typically signal underwatering or insufficient humidity. Yellowing leaves can be a sign of overwatering, leading to root rot. Fading patterns on the leaves suggest too much direct light. Common pests include spider mites, mealybugs, thrips, and fungus gnats. Regular inspection of leaves, especially the undersides, and prompt treatment with insecticidal soap or neem oil can manage infestations.
Propagating Calathea Silver
Propagating Calathea Silver is typically achieved through division, by separating parts of the plant’s root ball. Do this during repotting in spring or early summer when the plant is actively growing. Gently tease apart the root ball into smaller sections, ensuring each has a portion of the rhizome and at least a few leaves. Plant divisions in fresh, appropriate potting mix. Provide warm, humid conditions and consistent moisture to encourage new growth.