structure & bulk
compost
topsoil
coconut coir
cyathea trunk
wood fiber
aeration & drainage
sand
perlite
pumice
gravel
biochar (when activated)
water retention
coconut coir
vermiculite
clay
wood fiber
cyathea trunk (moderate)
nutrition
compost
worm castings
comfrey tea
rock dust
biological activation
worm castings
comfrey tea
compost
biochar (after inoculation)