| Sphagnum moss has become
increasingly popular as an orchid potting medium in recent years, particularly
with the introduction of high quality, long-fibered New Zealand sphagnum to the market
place. There are different grades of sphagnum available from locations throughout the
world; choose the one that fits your budget and quality requirements.
Sphagnum is easy to pot with, however you should pre-soak it overnight in 2 or 3 gallon bucket of warm water. Many growers like to add a teaspoon of an algaecide such as Physan or RD-20. Squeeze it out gently before packing it in around the roots of the orchid to be re-potted, taking care to not pack too tightly. A rhizome clip or stake may be used to stabilize the orchid. Sphagnum moss is difficult to re-wet once it has dried out so it is best to keep the plants evenly moist (but not soaking!) and adjust your watering schedule accordingly. This indicates not to use this medium for orchids that like to dry thoroughly between waterings. Although it is thought that the moss supplies some minor nutrition, it is best to fertilize plants potted in sphagnum with a balanced fertilizer such as 20-20-20. Additives such as charcoal and perlite are often used to prevent the moss from compacting and keep the mix open. Sphagnum can last up to two years but in practice plants are usually re-potted yearly, especially Phals. Sphagnum moss can harbor the fungus that causes the lymph infection Sporotrichosis. Although cases of infection are not especially common among orchid growers, the fungus can enter the body through a cut or other opening and cause symptoms from mild to severe. As a precaution wear rubber gloves when working with Sphagnum Moss.
New Zealand Sphagnum Moss |
