For different genera: two parts peat moss, one part coarse sand, one part Perlite, an amount of bark to suit the requirements of the orchid; to one bushel of that add two ounces limestone and two ounces magnesium limestone; add also fertilizer per bushel: one ounce for small seedlings, five ounces for large plants; water every two to four weeks; after two months fertilize every two weeks at half strength in summer, and in September and October once each month. OR76-83+
For different genera: use one bag of fir bark,medium, half a cubic foot each of redwood wool (Palco) medium redwood chips, and two gallons of Per lite, several buckets of German peat, all mixed with a rake. A74-711