The Calathea Sanderiana, also known as the Pinstripe Calathea, is a popular houseplant valued for its striking ornamental appeal. Its distinctive foliage makes it a favorite among indoor gardeners seeking to enhance their living spaces.
Calathea Sanderiana Overview
Calathea Sanderiana, often classified under the genus Goeppertia, features glossy, dark green leaves adorned with precise, thin pink stripes. These stripes create a vibrant contrast against the deep green backdrop. The undersides of the leaves often display a delicate purple hue. A unique characteristic, shared with other Marantaceae family members, is nyctinasty, where its leaves fold upwards at night and unfurl in the morning, mimicking praying hands. This species originates from the tropical rainforests of South America, where it naturally grows in dappled understory light.
Essential Care for Calathea Sanderiana
Light
Calathea Sanderiana thrives in bright, indirect light, mimicking its natural rainforest habitat. Direct sunlight can be harmful, causing pinstripes to fade and potentially leading to scorch marks on the leaves. If the plant receives too little light, its distinctive patterns may become dull. Placing it near a window with sheer curtains or in a room with ample natural light but no direct sun exposure is often ideal.
Water and Humidity
Maintain consistent soil moisture for Calathea Sanderiana, keeping the soil moist but never waterlogged. Overwatering can lead to root rot, while allowing the soil to dry out completely can damage foliage. Using distilled, filtered, or rainwater is beneficial, as Calatheas are sensitive to chlorine, fluoride, and minerals often found in tap water. High humidity, ideally above 60%, is crucial for this tropical plant. Increase ambient moisture by placing the pot on a pebble tray, using a room humidifier, or grouping plants together.
Soil and Potting
A well-draining, moisture-retentive potting mix is best for Calathea Sanderiana, such as a peat-based mix amended with perlite or bark. Proper drainage holes are essential to prevent root issues. Repotting is typically needed every one to two years, or when the plant becomes root-bound, to refresh the soil and provide space for continued growth. When repotting, select a pot only one or two sizes larger than the current one to avoid overpotting.
Temperature
Calathea Sanderiana prefers warm temperatures, ideally between 18°C to 27°C (65°F to 80°F). It is sensitive to sudden temperature drops and cold drafts, which can negatively impact its health. Temperatures below 15°C (60°F) should be avoided. Place the plant away from drafty windows, air conditioning vents, or heating sources to maintain a stable environment.
Fertilizing
During its active growing season in spring and summer, Calathea Sanderiana benefits from regular fertilization. Apply a diluted, balanced liquid houseplant fertilizer, such as a 10-10-10 or 20-20-20 NPK ratio, every two to four weeks. Dilute the fertilizer to half strength, as these plants are sensitive to over-fertilization. Reduce or stop fertilizing entirely during the fall and winter months when the plant’s growth naturally slows.
Addressing Common Calathea Sanderiana Issues
Leaf Issues
Calathea Sanderiana shows specific signs when environmental conditions are not met. Browning leaf tips and edges often indicate low humidity or tap water sensitivity; increase humidity and switch to distilled or filtered water. Curling leaves signal underwatering or insufficient humidity, requiring more consistent soil and air moisture. Yellowing leaves, especially at the base, can be a symptom of overwatering; adjust watering frequency to allow the top inch of soil to dry slightly before the next watering.
Pests
Pests can affect Calathea Sanderiana. Spider mites are a frequent concern, especially in dry indoor conditions, causing stippling and fine webbing on leaves. Mealybugs appear as small, white, cotton-like masses, typically on the undersides of leaves or in leaf axils. Scale insects are small, immobile bumps on stems and leaves. Promptly isolate affected plants and treat with insecticidal soap or neem oil. Maintaining appropriate humidity levels can also help deter spider mites.
Propagating Calathea Sanderiana
The most effective propagation method for Calathea Sanderiana is division, typically performed during repotting in spring or early summer when the plant is actively growing. Carefully remove the plant from its pot and gently loosen the soil around the roots, looking for natural divisions within the root ball. Using clean, sharp shears or your fingers, gently separate these divisions, ensuring each new section has healthy roots and at least two to three leaves. Pot each division into a new container with well-draining potting mix, planting them at the same depth as the parent plant. Water thoroughly and place in a warm, humid environment with indirect light; covering with a clear plastic bag can boost humidity and aid recovery.
Is Calathea Sanderiana Safe?
Calathea Sanderiana is considered non-toxic. The plant does not contain any harmful substances that would pose a risk if ingested by cats, dogs, or humans, making it a safe choice for households with pets and children. While safe, keeping houseplants out of reach of curious pets and small children is always a good practice.