Orchiata bark compost perfect for all types of Orchid Plants, recommended by top growers around the world, Retains Structure , Re wets easily, use straight from the bag no need for sterilization, Dolomite addition creates a stable PH adjusted substrate, Produced from sustainable renewable, man-made forests. This orchid compost has been specifically designed for orchids, and both hobbyists and commercial orchid nurseries have proven its ability to produce superior growth on orchid plants. Power 9-12mm, orchid compost suits both young and more mature orchids, a good size for second potting.