Ha Xuan - how about a little info about hydroton? I'm not familiar with it. Looks like rocks...? Gorgeous bloom!
Kris, hydroton is made of clay, fired in a rotating kiln at 1200oC so that the core expanded (like popcorn). It's very porous, clean and most importantly, a renewable source.I got the info from the Internet.Many orchid growers use hydroton in their semi-hydroponic culture.
Is it leca? I hope orchid will like this media - cleanner and nicer looking than charcoal ;-) But looks like this will retain more moisture...
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