I'm starting a little cacti shelf and I was wondering what would be the best all around cactus soil mix I could make up that should work fine for just about every thing? I sprouted Trichocereus seed in about 60-70% peat & 30-40% perlite but I hear that small pumice "is better" for growing cactus than perlite. Why is that? I am planning on sprouting/growing a bunch of small weird looking cacti so I'm curious about something that "should" work for most everything.
What is your preferred cactus mix and where do you find obscure stuff like small pumice, large grit sand, etc?
Other than off Ebay where the shipping is more expensive than the product.
Thanks for any primers you guys can give me!