Same formula we've used for many years, Eric.
- 8 parts Sequoia seedling bark (1/8-1/4" particle size)
- 1 part coarse perlite (1/8-1/4" particle size)
- 1 -part #3 size charcoal
- 1 - part chopped NZ sphagnum moss (1-2" length)
We use these particle sizes because the mix promotes good drainage. For adult plants or long petalled Phrags. we replace the 8 parts seedling bark with 4 parts Medium size bark and 4 parts seedling size bark.