Adiantum raddianum, commonly known as Delta maidenhair fern, is a perennial herbaceous plant native to the tropical rainforests of South America. It thrives in the understory of these forests, where it enjoys the dappled sunlight and high humidity. This fern typically grows to about 17-19 inches tall and can spread up to 22 inches wide. Its delicate, fan-shaped fronds are supported by shiny, dark, wiry stems that resemble human hair, giving the plant its common name. The fronds are comprised of small, triangular leaflets, which contribute to the fern’s airy and elegant appearance.

Delta maidenhair fern is celebrated for its graceful form and is often used as an ornamental houseplant. It requires a consistently moist environment, making it ideal for terrariums or as a bathroom plant where humidity is naturally higher. While it prefers bright, indirect light, it can tolerate lower light levels, which adds to its versatility as an indoor plant. In terms of temperature, it is hardy down to 5°C and is suitable for USDA zones 10 and 11. Gardeners should be vigilant for pests such as scale and mealybugs, which can be managed with regular inspection and treatment if necessary. This fern has earned the Royal Horticultural Society’s Award of Garden Merit, indicating its value in cultivation. However, it can become invasive in some regions when grown outdoors, so care should be taken to prevent its spread in non-native areas.CC BY-SA 4.0