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PlantSnap
Plant Care
Delta maidenhair fern
(Adiantum raddianum)
Also Known As
Delta maidenhair fern, Maidenhair fern, Southern maidenhair fern
About This Plant
Adiantum raddianum is a species of fern with delicate, lacy fronds that are held on wiry, black stems. It is native to the tropical regions of the Americas, including South America, Central America, and the Caribbean. The plant is commonly grown as a houseplant due to its attractive appearance and ease of care.
Plant Care Instructions
Outdoor Size Range
12-24 inches (30-61 cm)
Light Requirements
Adiantum raddianum prefers bright, indirect light. Direct sunlight can scorch the delicate fronds, while too little light can cause the plant to become leggy and sparse.
Humidity Needs
Adiantum raddianum prefers high humidity levels, around 50-60%. Mist the plant frequently or place it on a tray of pebbles filled with water to increase humidity around the plant.
Fertilizing Schedule
Feed Adiantum raddianum with a balanced, water-soluble fertilizer every 2-3 weeks during the growing season (spring and summer). Do not fertilize during the winter months.
Pruning Guidelines
Remove any yellow or brown fronds as they appear to keep the plant looking tidy. You can also pinch back the tips of new growth to encourage bushier growth.
Common Pests and Diseases
Common pests for Adiantum raddianum include spider mites, mealybugs, and scale insects. Treat infestations with insecticidal soap or neem oil.
Indoor Size Range
12-24 inches (30-61 cm)
Watering Schedule
Delta maidenhair ferns prefer consistently moist soil. Water the plant when the top inch of soil feels dry to the touch, and avoid letting the soil dry out completely. Use room-temperature water to avoid shocking the roots.
Temperature Range
Delta maidenhair ferns prefer temperatures between 60-75°F (15-24°C). Avoid placing the plant near drafts or heating/cooling vents.
Growing Season
Adiantum raddianum grows best during the spring and summer months, when temperatures and humidity levels are higher.
Growing Difficulty Level
Adiantum raddianum is considered a moderately easy plant to grow, but it does require consistent care and attention to thrive.
USDA Hardiness Zones
Adiantum raddianum is not frost-tolerant and is best grown as a houseplant. It is suitable for USDA hardiness zones 10-12.
Did You Know?
Adiantum raddianum has been used medicinally by indigenous peoples of the Americas to treat a variety of ailments, including respiratory issues and digestive problems.
