Phal, too many new roots?

[Ray]

That looks like a very open, dry bark. Great for aeration, poor for water-holding capacity until well broken-in.

I suggest you put it in the sink and run lukewarm water through it for a good 15 minutes, rotating periodically to make sure it's all wetted. Wait 30-60 minutes, and repeat.

You'll find that the bark will hold more moisture going forth, and never let it dry out completely.