Salvia is a Sage, there are hundreds if not thousands of "Salvia's", but the only potent one that is smoked is Salvia Divinorum. The plant is a curiosity to many because it does not produce seeds commonly, they are EXTREMELY rare, most plants only make seeds every few years, even when hand pollinated. Salvia grows in the wild because when it grows tall, the weak stem bends and the plant touches the ground, and then roots further from there. You can not buy salvia divinorum seeds anywhere that i know of right now, but you can buy cuttings and grow the plant from their.