The Mauna Loa Plant (Anthurium andraeanum ‘Mauna Loa’) is a captivating houseplant known for its vibrant appearance. Its striking, waxy, heart-shaped spathes, often red, pink, or orange, are modified leaves that surround a finger-like spadix containing the true, tiny flowers. The plant’s glossy, heart-shaped green foliage grows on long stems, creating an attractive bush. Originating from the rainforests of Central and South America, this tropical plant has specific care requirements.
Essential Care Guidelines
Light
The Mauna Loa Plant thrives in bright, indirect light. Place it near a north or east-facing window to avoid direct sun, which can scorch leaves. If direct sun is unavoidable, use sheer curtains for diffusion.
Watering
Maintain consistent soil moisture, but avoid sogginess. Water when the top inch or two of soil feels dry, ensuring water drains from the pot’s bottom. Allowing tap water to sit overnight before use can help dissipate chlorine, which the plant can be sensitive to.
Humidity
High humidity is required. Brown leaf tips or edges indicate insufficient humidity. Increase moisture by regular misting, using a pebble tray, or placing a humidifier nearby.
Soil and Potting
Use a well-draining, airy potting mix rich in organic matter, such as one formulated for aroids or orchids. The pot must have drainage holes to prevent waterlogging, which can lead to root issues.
Temperature
Maintain warm, consistent temperatures, ideally 65-80°F (18-27°C). The plant is sensitive to cold drafts and temperatures below 55°F (13°C), which can hinder its growth and cause damage. Ensure a stable environment, avoiding sudden fluctuations.
Fertilizing
Fertilize monthly during the active growing season (spring and summer) with a diluted balanced liquid fertilizer. Reduce feeding in autumn and stop in winter when the plant’s growth slows. Over-fertilization can cause issues like burnt roots or green spathes.
Troubleshooting Common Issues
Yellowing leaves
Yellowing leaves can indicate overwatering or nutrient deficiency. Address overwatering by allowing soil to dry between waterings. If yellowing persists, a balanced fertilizer may correct nutrient imbalances.
Brown leaf tips
Brown leaf tips or edges often result from low humidity, underwatering, or fertilizer salt buildup. Increase humidity with misting or pebble trays, and ensure consistent watering. Occasionally flushing the soil can also help.
Lack of blooms
A lack of blooms might stem from insufficient light or incorrect fertilizing practices. Moving the plant to a brighter, indirect light location and ensuring proper fertilization during the growing season can encourage flowering.
Pests
Pests such as spider mites, mealybugs, and aphids can affect Mauna Loa Plants. Regularly inspecting the plant helps in early detection. Minor infestations can often be managed by rinsing the leaves with water or using insecticidal soap or neem oil.
Root rot
Root rot, characterized by mushy, brown roots, is a common issue caused by overwatering or poor drainage. Prevent this by using a well-draining soil mix and a pot with drainage holes. If root rot is present, affected roots should be trimmed during repotting.
Propagation and Repotting
Propagation
Propagating the Mauna Loa Plant is commonly achieved through division of its clumps. This involves carefully separating sections of the mature plant, ensuring each new section has some roots attached. Using clean, sharp tools helps prevent damage and disease.
Repotting
Repotting is typically needed every 1-2 years or when the plant becomes root-bound. The best time for repotting is in early to late spring, when the plant is actively growing. Choose a new pot that is only slightly larger, about 1-2 inches wider in diameter, to avoid excessive soil that can retain too much moisture. When repotting, use fresh, well-draining soil and remove any dead or rotting roots.
Safety Precautions
The Mauna Loa Plant, like other Anthurium varieties, contains insoluble calcium oxalate crystals, making it toxic if ingested. These crystals can cause irritation and swelling of the mouth, tongue, and throat. Keep the plant out of reach of children and pets. Wearing gloves when handling the plant can also help prevent potential skin irritation from its sap.