C. mossiae

[Frdemetr]

It's very usual to grow orchids on stones (not s/h) in Brazil (when weather is humidy, or with automatic misting systems). Fren posts the major advantaje (the roots never rot). Stones are not neutral, and this fact could harm the plants:
1) "Brita" (I don't know the word in english, the tritured rock used in constructions to made concrete) is made from granite and gnaisse are acid, and Laelia lobata, some Cattleyas grow well. Some rupiculous Laelia loves basic rocks, like calcarium, and do not grow well in "brita"
2) Acid or basic, the stones must do not have sulphur (in any quantity)
3) As I posted before, nitrogen is the great problem, if one uses only stones he or she need to mist a solution with more proportion of this nutrient
4) Do not hang the pots, they are to much heavy!

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