Orchid Potting Mix

Orchids evolved to grow with their roots exposed to air, clinging to tree bark or rocks. Their thick, spongy roots (called velamen) absorb moisture from the air and brief rain showers. When you pack these roots into regular soil, moisture stays trapped against the root surface for too long. This triggers bacterial and fungal infections that cause root rot. In the Philippine climate, where humidity regularly exceeds 80%, dense media stays even wetter for longer. Orchid potting mix solves this problem by using chunky, open materials that drain in seconds and allow air to circulate freely. The result is a growing medium that mimics the orchid's natural habitat on tree branches. Healthy orchid roots are firm, green or silver, and grow actively. Rotting roots are brown, mushy, and smell sour.

Good orchid potting soil shares a few key traits regardless of the specific materials used. First, the pieces should be chunky, between 1 and 3 centimetres across. Fine materials compact and hold too much water. Second, the mix should drain completely within a few seconds of watering. Third, it should resist decomposition for at least 12 months. Materials that break down quickly become soggy and acidic. Fourth, the mix should be free of salt buildup from fertiliser residue. For tropical orchids in the Philippines, coconut husk chunks, charcoal, and tree fern fibre are the best locally sourced materials. Imported options include fir bark, sphagnum moss, and perlite. Avoid any mix that contains soil, coco peat, or fine compost. These materials hold too much moisture for standard potting and are completely wrong for orchids.

Making your own orchid mix at home is simple and saves money compared to buying imported mixes. Here is a proven recipe using materials available across Metro Manila.

Basic Orchid Mix Recipe (Philippines)

• 50% coconut husk chunks (cut into 2-3 cm pieces, not fine coco peat)
• 30% charcoal pieces (hardwood charcoal broken into 1-2 cm chunks)
• 20% perlite or pumice (medium grade for added drainage)

Preparation Steps

1. Soak coconut husk chunks in water overnight. This removes excess tannins and salts.
2. Rinse charcoal pieces under running water to remove dust and fine particles.
3. Combine all three materials in a basin and toss until evenly mixed.
4. The finished mix should feel open and chunky. Air should flow through it easily.

For Vandas and other heavy-rooted orchids, increase the charcoal to 40% and reduce coconut husk to 40%. For miniature orchids, chop all materials into smaller 0.5 to 1 cm pieces. Some growers add a handful of loam soil for terrestrial orchids like Spathoglottis, but keep it under 20% of the total volume.

If you prefer convenience, several brands sell pre-mixed orchid potting soil in the Philippines. Look for mixes that list bark, charcoal, and perlite as primary ingredients. Avoid products that contain soil or fine peat. Garden centres in Quezon Memorial Circle, Marikina plant shops, and some Ace Hardware branches stock orchid media. Online, Shopee and Lazada carry imported mixes from brands specialising in orchid care. Expect to pay more for imported bark-based mixes compared to local coconut husk blends. For most Filipino orchid growers, the DIY coconut husk recipe above performs as well as or better than imported alternatives. Visit our shop for base soil materials and our supplier page for delivery options.