Medium Fir Bark Orchid Potting Mix is a great all around mix for many orchids! Perfect for Phalaenopsis and Cattleyas! Medium fir bark is combined with charcoal and perlite, for good air circulation and moisture retention. 1 gallon bag contains enough mix to fill approximately 3 of our 5.5" round pots. Medium Fir Bark Mix MIXFIRMED$7.75, 2/$14.50 Site Index: page 1, page 2, page 3, page 4. Front Page