This question has been on my mind for a while and would love to get some ideas.
When I've made my own potting mix before (for ginger and sweet potatoes), I used 1/3 coconut coir, 1/3 sand and 1/3 compost, and got good results.
However, since the coconut coir I got was imported from Sri Lanka, and coconuts don't grow locally, I was hoping to find a local material to use. Any thoughts?