Getting the tightness of Phalaenopsis potting medium right matters: should you pack sphagnum moss tightly when planting?

Do your Phalaenopsis orchids keep getting root rot? Today we will walk you through adjusting the firmness of your potting mix based on its type, so the roots can breathe freely and won't rot.

When growing Phalaenopsis orchids, the potting mix (sphagnum moss, bark, pine cones, etc.) can be too loose, and then the roots can't grip it and can't absorb water or nutrients; or too tight, which is like covering your nose, suffocating the roots and causing rot. The perfect state is this: the roots can sit firmly "nestled" in the potting mix, excess water drains away quickly after watering, and when dry the mix still clings gently to the roots without leaving big gaps.

Sphagnum moss type potting mix

Sphagnum moss is the potting mix beginners use most, but many people either spread it too loosely or pack it down hard, and the result is either dried-out roots or root rot.

The right way is this: when you wrap the roots in sphagnum moss, press gently with your fingers - you should feel the moss clinging tightly to every root, but when you let go the potting mix should still be "fluffy" and not form hard clumps.

Little trick: after pressing, grab a handful of sphagnum moss and pull gently - you should feel slight resistance but it should not be compacted. Once it dries, check around the roots; if there are no big gaps you could fit a fingernail into, the firmness is just right.

Bark/pine cone type potting mix

Bark, pine cones and other hard potting materials have gaps of their own and are extremely airy, so beginners must not get itchy hands and pack them down!

When planting, just spread the roots out and bury them, then gently shake the pot so the potting mix naturally fills the gaps around the roots; there is no need to press deliberately. If you are worried the mix is too loose, at most spread a thin layer of sphagnum moss on the surface to hold it in place, but the bark underneath must stay loose.

Practical tips

1. To hold the plant steady, many flower shops press the sphagnum moss extremely tight (especially Phalaenopsis orchids bought online). When you receive one, be sure to first pull apart the surface moss and use a toothpick to gently loosen the potting mix around the roots, giving the roots some breathing room.

2. After watering, if water seeps out of the bottom of the pot slowly, or water sits in the saucer for more than 10 minutes, the potting mix may be too compacted! Quickly take the plant out, pull apart the sphagnum moss/bark and repot it, focusing on clearing the drainage layer at the bottom to make sure excess water can flow away.

3. Once the potting mix dries, if you see obvious gaps between the roots and the mix (you can see bare roots), gently push some new potting mix into the gaps with your fingers, then press it down a little; if the roots are still clinging tightly to the mix, leave it alone to avoid disturbing it too often and damaging the roots.