From my experience with perlite, the shit floats up to the surface some how. Like it diffuses up through the coco/soil and ends up concentrated at the surface. Probably because it's less dense than the soil.So whats the thing with covering the cocos with perlite?
Gotcha. I used on coco and still use on soil just the lava rocks from home depot, they seem to work well.I think he means covering with perlite as a preventative for gnats not mixing in the coir.
Which is a pain. You can water slowly after transplant until it stiffens up but it still floats up a bit.
The perlite layer is similar to the sand idea, no? Never done either.