Stevia Plants, to be precise their leaves are being used as a natural sugar substitute in some countries like Japan, India and over South American for decades or centuries now.
Especially in the European Union, Stevia was only lately approved (December, 2011) by the WHO for human consumption, after several evaluations for toxicity and Long-Term Health Effects.
More information here.
Q: Where can I buy Stevia seeds?! It seems, after several approaches to get my hands on the seeds, that i either asked the wrong people, they never heard about it or couldn't point me in the right direction. Right now I live in Frankfurt, but anyway online resellers are just fine with me!
Also, if anyone of you is experienced, in growing this particular plant from seeds, feel free to give me some advice of how to do it right.