Phragmipedium calurum

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Brabantia

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A plant cultivated in a mix 60/30/10 rockwool/sponge rock/charcoal. The sponge rock I use is synthetic, it is a popcorn expanded clay special hydroponic.
 
A plant cultivated in a mix 60/30/10 rockwool/sponge rock/charcoal. The sponge rock I use is synthetic, it is a popcorn expanded clay special hydroponic.

Do you have some info on the sponge rock you use? I use perlite in my mixes but particle size is quite small, would love to get some coarser stuff.
 
grodan Vital is a special rockwool which is produced and controlled for plant culture big blocks for about 2€ at ebay. Plus shipping.
Use this one on more and more Phrags.

This is the stuff a lot of big growers in NL use too.
 

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