An update in this topic is needed
Growing Stevia plants is not hard at all. Stevia has been banned and forbidden to use by the big sugar companies.
But these days more Stevia is added to softdrinks and sugar replacers.
Stevia is a subtropical plant which leaves are very sweet tasting when chewing on them.
I am not going to tell more about the history but how to grow them.
Just take some fresh cuttings from a Stevia plant and put them in a glass jar. Fill the jar with fresh water till the cuttings are one-third in the water. Put them in a well daylight lit window. And wait. In a werk time little roots will start growing.
In the next stage I've put one pellet of Tibolar-RS NPK 13.6.2. Garlic with the rooted cuttings.
Whyle studying the pictures and their dates I noticed that the 14 days it took to get rootgrowth were wrong.
It took only 10 days to get these results.