Interesting thread, I need to read more of the scientific research on this. The best tasting cannabis plant I’ve ever smoked was an Afghani #1 plant grown in the shade of a small tree on a hillside in a chaparral river canyon and I believe it had everything to do with the mineral /silt content of the soil but also the decomposed highly aromatic containing organic materials from the chaparral ecosystem. It had a complexity to the aroma which made me realize cannabis terroir could really matter.
I haven’t come close to it but I have been adding various fresh and dried aromatic herbs to my living soil blend and letting it undergo decomposition by the worms and bugs and microbes in there. A lot of basil biomass, dried eucalyptus, pine needles, organic citrus peel, among many others. I had some left over myrrh powder this year I threw in there too. I also am mulching the cannabis plants in the living soil bed heavily with basil flowers from my various basil plants once they initiate flowering. I can’t say what’s doing it because I’ve changed a lot this year but I am noticing that the terpene intensity/complexity has improved over last year.
Its funny you mention the soil meant to help express the frankincense pheno. I had a similar out there idea earlier this year of cooking a very small batch of experimental soil for growing out a very aromatic landrace hash strain:
1 part cannabis kief
1 part frankincense powder
1 part myrrh powder
1 part dolomite lime / gypsum blend
1 part sifted high quality compost
1 part sand
1 part pumice