Mate its a weed..

I do outdoors every year and after they have establised themselves in the starter pots.
I transplant them into Larger Pots and I only use Straight water to settle them in..

once they have been sexed and are large anough to cope with the Occasional grasshopper.

I put em in the Ground...

I use liquid worm castings(worm shit).
and a Good quiality Potting mix.
and also Mix it with Mushroom compost.
and I'll also give them the Blue Nitro Pellets twice a year also..

Because im in the sub.tropics I will have to water every afternoon in the summer and every second day when flowering starts...
They get enough nutrients out of the ground.
so I give em Mostly water and I aint had no complaints.....