ya Sunshine, it's very easy to obtain flower and seeds, but those seeds are steriles and didn't sprout. I got some seeds from the sage wisdom, i try to sprout them, zero success. even with gibberelic acid, different dosage: 500 ppm, 250,1000.... salvia divinorum seeds are frustrating. I read some very serious study, and it said that there is a misfunction who forbid the male gamet to arrive to the female nucleus. So there is seeds, but inside the gametes are not mixed. Daniel Siebert, the specialist of salvia divinorum, is looking for every report about seedling success.
this is his website:
http://www.sagewisdom.org/And about the diseases, for my part, it was very comon molt, who are normaly very well fight by a vegetative step plant. Sometime i see those fungus on plants in a step of mature fruiting, when the plant "know she achieve her reproduction cycle, seeds are ready and she know she can let her go and die". But it was on vegetative cycle.... i guess in the growshop and specialized greenhouse they should use some hormons to keep the original strains, but when neophytes buy some cuttings, they are often disappoint after several weeks.