Cannabis

I grow Indica plants (more relaxed). Put seeds on a paper towel and keep it wet. After sprouting put them in a large pot with good soil specifically designed for this, they'llbecome massive if the pots big enough. Water often. Learn to pinch the tops now and then. Easy Peasy.

If you want higher yields learn to bend them horizontal, it turns you plant into a mega plant. Oh, it's important that you destroy any plants that begin to show seeding.