about 1cm is how long you want the taproot, 1/4" depth will do, 50/50 perlite will do will but you will have to water more often, make sure to keep your eyes on it, not at first, but after the plant roots the pot it will dry out quick.
Hey I started germinating some good seeds I've been saving but had to leave town for 6 days for work so now the tap roots are about 1 1/2 inches long & some of them are even forming leaves. What if I planted them in a nice mix does anyone think they would make it? I'm gonna trash them tonight unless some1 says otherwise