1:1:1 sand:clay soil:perlite by volume has worked pretty well as a well drained low-nutrient medium for me in the past. Generally around 8-10% organic matter by wright is considered a sweet spot so I would consider starting with half a part compost.
I'm trying to do it without perlite though. Preferably, without buying anything. I wanna say most potting soil mixes have an organic matter content well above 20%. And clay soil, while abundant here, is the worst for drainage which is kinda key in potting soil.
1:1:1 sand:clay soil:perlite by volume has worked pretty well as a well drained low-nutrient medium for me in the past. Generally around 8-10% organic matter by wright is considered a sweet spot so I would consider starting with half a part compost.
I'm trying to do it without perlite though. Preferably, without buying anything. I wanna say most potting soil mixes have an organic matter content well above 20%. And clay soil, while abundant here, is the worst for drainage which is kinda key in potting soil.