Homemade Phalaenopsis Orchid Potting Mix

A simple bark-based mix for moth orchids.

This homemade potting mix is designed for Phalaenopsis orchids, commonly called moth orchids. Fir bark, horticultural charcoal, and coarse perlite create a loose, airy growing medium that drains freely and allows air to circulate around the roots.

Homemade Phalaenopsis Orchid Potting Mix

Makes about 7 cups

• 5 cups medium-grade fir bark (¼–½-inch pieces)
• 1 cup horticultural charcoal
• 1 cup coarse perlite (sponge rock)

1. Place the fir bark in a large, clean mixing container.
2. Add the horticultural charcoal and coarse perlite.
3. Toss until the three ingredients are evenly distributed.
4. Lightly moisten the mixture before repotting to help hydrate the bark.
5. Position the orchid in a pot with drainage holes. Gently work the mix around the roots without forcing or packing it tightly.
6. Leave the crown (the point where the leaves meet) above the surface of the potting mix.

Tips for success

Use orchid-grade bark. Avoid decorative landscape mulch, which may be unsuitable for orchid roots.

Keep the crown uncovered. Do not bury the central growing point.

Choose drainage. A pot with drainage holes is essential; side ventilation can also help.

Check moisture regularly. Bark-based mixes generally dry faster than moss-based mixes, so adjust watering to your conditions.

Yield: Approximately 7 cups of mix, before settling.

A note about store-bought orchid mixes

Many commercial orchid mixes already contain bark, charcoal, and perlite. This homemade version offers a way to control the proportions and particle size; it is not necessarily cheaper or better than a quality retail mix.

For light, watering, and reblooming, see the [Moth Orchid care guide](/blooms/houseplants/moth-orchid/).