Phalaenopsis "Pandora's Box" losing leaves but still has plenty of roots.

[Desdinova]

I suggest not feeding until it's been thoroughly watered first if underwatering is the culprit.

Sphagnum is usually safest, but if you're not comfortable with that, may I suggest mixing sphagnum with bark or LECA in the proportion that suits you? Maintaining water and humidity for orchids in a household situation can be tricky. I also suggest a modest increase in light. Phalaenopsis can take diffused southern exposure in northern environments like yours.

Hope this helps.

[Roberta]

Another ancient thread, also 2010. Don't expect a response...