I've just bought bags of cocoa bean hull mulch, shredded pine/spruce mulch and sphagnum moss. I've never used cocoa or pine mulch in potting mixes for my indoor plants (only as top dressing in flower beds). Is it ok to use them in a mix for hoyas? I'm about to repot some rooted cuttings, and don't want to use something that might harm them. :/ I plan to mix in a lot of perlite too, as the cuttings have been rooted in plain moist perlite.
Here is a picture of the sphagnum (left), cocoa (middle) and bark (right) - you can see that the bark is quite finely shredded, and the coarser cocoa hull mulch would give a nice texture to the potting mix.
What do you guys think? Have any of you used cocoa hull mulch in your hoya potting mix?