sphagnum

[swiatoniowski]

Hello,

I have some very simple question refers to sphagnum. A few months ago I repotted some orchids into fresh New Zeland sphagnum. It was bright yellow. Now, after just about 4 months it change colour into much darker, grey-brown... When I saw orchids in some collections, sphagnum usually looks very bright in colour... I know, that generally plants in sphagnum should be repotted every year. But, please tell me if this is just normal, that it change colour so fast ?

Piotr