Orchid bark
/ˈɔrkɪd bɑrk/
Definition
Orchid bark is a coarse potting material made from pieces of tree bark, commonly fir or pine, used as a growing medium for many orchids. Unlike regular potting soil, it has large particles and air spaces that let roots breathe and dry between waterings. It is used especially for epiphytic orchids, plants that naturally grow on trees, because it mimics the loose, fast-draining conditions around their roots.
Use in Gardening
- Root aeration: Orchid bark helps create air spaces around roots, which is important for many epiphytic orchids that naturally grow attached to trees rather than in dense soil.
- Moisture balance: It holds some water on the bark surface but drains quickly, reducing the long periods of saturation that can contribute to root decline.
- Mix component: Growers often combine orchid bark with materials such as perlite, charcoal, or sphagnum moss to adjust drainage, airflow, and water retention for different orchid types.
- Breakdown over time: As orchid bark decomposes, particles become smaller and the mix stays wetter. That change is one reason orchids are repotted periodically into fresh material.
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