Hello mark
I use for romana
2 parts seramis, 2 parts perliet and 1 part buzz cuzz cocos
For lapponica, maculata, majalis, saccifera, sambucina, traunsteineri I use
1 part peat
1 part perliet
1 part buzz cuzz cocos
1 part sand
For incarnata, praetermissa, praetermissa junialis
I use the same for maculata + 1 part potting soil
Frans IJsselstijn