When I switched from aspen to cypress mulch, I was amazed! It holds moisture much better, as well as odors. Cypress is amazing at odor control, and I bet orchid is the same. When I used aspen, the smell of poo or pee was horrendous, but now that I switched to cypress mulch, I can't even tell sometimes and I have to poke around to make sure they didn't urinate anywhere.
Of course, humidity control is much better as well.
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