Dendrobium Orchid Potting

Types of Potting Media

• Orchids do not use soil because their roots acquire nutrients from the air and nearby plant surfaces. Each genus of orchids has its own potting needs. A number of different types of potting media are used for orchids, including sphagnum moss, perlite, fir bark, tree fern fibers and coconut husk. Small stones, wood chips or even Styrofoam peanuts can be used as a medium. Sometimes a mixture of media is used. The important thing to remember is that dendrobium orchids get their nutrients from air, so ensure that whatever media you use holds the plant, yet is loose enough to allow air to circulate around the roots.

How to Pot Orchids

• Many types of containers are used for potting orchids, including clay, plastic, woven containers and wood. As epiphytic plants, Dendrobrium are tree-dwelling orchids that need free aeration of the root systems. Containers that expose the roots to the air will require more frequently irrigation than pots that are enclosed. Whatever type of pot you use, it must have drainage holes that allow water to flow over the roots. Dendrobium orchids do not thrive when their roots sit in water.

  Ensure that the pot you choose will accommodate 2 years of growth. Place the medium loosely in the container and position the plant in the medium, gently spreading the root system throughout the media. Pack firmly.

When to Repot Dendrobium Orchids

• When to repot is an issue that can cause some confusion for beginning orchid-growers. The general rule is, if in doubt, wait a little longer to repot. If the growing medium appears to be breaking down and unable to support the dendrobium properly, it needs repotting. Roots extending outside the pot's bottom, sides or rim are another sign that it's time to repot. Generally speaking, dendrobiums benefit from repotting every two or three years.

Potting Problems

• Do not plant orchids and their growing media in oversized containers, as orchids prefer being a little snug in their pots. A too-large pot can leave the media wet at the center for a long period of time, allowing roots to sit in water for extended periods, which which can lead to rotting diseases.