Does moss growing in the pot of a Phalaenopsis have any effect? First, distinguish clearly between sphagnum moss and green moss

"I carefully tended my Phalaenopsis and just changed the sphagnum moss, how come green moss grew within a few days? Has the sphagnum moss gone bad?" Sphagnum moss and green moss are two completely different things, and their uses and effects on orchids are worlds apart.

Sphagnum moss is a great partner for growing Phalaenopsis. The sphagnum moss we buy is all dry; after soaking it becomes soft and light green or yellow-brown, feeling like a sponge, with especially strong water absorption and retention. It is harvested by hand, then processed and sun-dried, specifically used as orchid potting medium; it can anchor the Phalaenopsis root system and slowly release moisture, keeping the aerial roots ina "moist but not waterlogged" state, and its air permeability is also quite good, so the roots can breathe comfortably. When repotting, we wrap the sphagnum moss around the Phalaenopsis roots or spread it on the pot surface, relying on it to help the orchid "drink" without smothering the roots.

Now look at green moss; this stuff mostly grows on its own as an"uninvited guest." It is generally bright green, clinging in a thin layer to the pot surface and pot walls, and some even burrows along the gaps in the sphagnum moss, feeling slippery to the touch. It is not a potting medium we actively use, but rather when the environment is too humid and light is too little, green moss spores in the air land on the pot surface and gradually multiply. Simply put, sphagnum moss is "invited to help," green moss is "self-invited," and they are fundamentally not the same thing, so never confuse them.

So if green moss grows in the pot, does it affect the Phalaenopsis? Don't panic first; green moss itself doesn't bite--it won't gnaw on the orchid roots, nor will it rob the orchid of nutrients, but if left unchecked, trouble comes.

The first trouble is that you cannot judge when to water. When growing Phalaenopsis, we originally water when the sphagnum moss on the pot surface turns white and feels dry to the touch, but with a layer of green moss covering it, you simply cannot see whether the sphagnum moss below is dry or wet. Either you think it hasn't dried and keep not watering, and the roots wrinkle from lack of water; or you think it's time to water, but the layer below is still wet, and as soon as you water, the roots get smothered, and over time the roots easily rot.

The second trouble is that it affects air permeability. Green moss clings to the pot surface like a little plastic film, blocking air circulation, so the moisture in the potting medium cannot escape, and the sphagnum moss or bark easily molds. The aerial roots of Phalaenopsis especially need to breathe; smothered in a humid and airless environment, they quickly turn from white to brown and gradually rot.

If green moss has already grown, how should you deal with it? If there are only a few scattered patches, just gently pick them off with small tweezers, without injuring the nearby aerial roots. After picking, move the flower pot to a place that gets scattered light, such as by a window, and let it get sun for2-3hours a day; light can inhibit green moss from growing again; watering should also be changed, watering only after the potting medium2cm below the pot surface is dry, and after watering, pour out the standing water in the tray, don't let the pot bottom soak.

If the green moss has covered the entire pot surface, or even burrowed into the potting medium, then you have to repot. First take out the Phalaenopsis, gently shake off the old sphagnum moss, rinse the roots clean with clear water, and check whether there are any rotten roots (rotten roots are brown and mushy); if there are, cut them off with sterilized scissors, soak for10minutes in carbendazim solution, let dry, then repot with fresh sphagnum moss; don't press the new sphagnum moss too firmly, leave some gaps for air.

When growing Phalaenopsis, choose proper orchid-specific sphagnum moss, deal with green moss promptly, usually ventilate more and water less, don't let the environment be too humid, and only then can the orchid grow vigorously and bloom abundantly!