Nephrolepis exaltata “Duffy”

Mini sword fern as a natural climate regulator in the terrarium

The Nephrolepis exaltata “Duffy”also known as the mini sword fern, is a charming and easy-care plant that is ideal for use in terrariums. With its bushy, compact growth and finely feathered, fresh green fronds, it brings not only tropical flair but also vibrancy to any natural habitat.

This fern originally comes from the tropical regions of South America and the Caribbean, where it thrives in damp, shady forests. In the terrarium, the “Duffy” is very adaptable and impresses with its compact size of around 20-30 cm, making it perfect for small to medium-sized tanks. Its dense leaves also offer ideal retreat and climbing opportunities for invertebrates such as Isopods, millipedes or jumping spiders.

The light requirements are moderate: The “Duffy” thrives best in indirect light or under artificial light with about 800-1200 lumen. Direct sunlight should be avoided as it can burn the delicate fronds. It also remains healthy in shadier areas, but grows somewhat more slowly there.

Another plus point is their preference for high humidity humidity of 70-90 %This makes it ideal for rainforest or tropical terrariums. It actively contributes to the microclimate in the tank by stabilizing the humidity and releasing oxygen.

With its compact, dense growth, the Nephrolepis exaltata “Duffy” is perfect for ground arrangements, small green islands or as a lively structural plant between larger species. Its easy-care character makes it an excellent choice for both beginners and experienced terrarium keepers.