Tree Fern Fiber (NZ)Tree Fern Fibre has become well known for being a 'miracle' potting substrate. We've yet to find a plant that doesn't thrive on it! It is a soft, spongy, long lasting and natural material that offers excellent drainage, aeration and moisture holding abilities. You can use it on its own or add it to your favorite potting mix. I like to mix it with some perlite and a bit of orchid bark. I also like it to use on its own to root cuttings and seedlings!