Are all Salvias edible?
In respect to this, are Salvias poisonous?
A: Not the species of salvias that we grow in gardens. They're all considered to be non-toxic, which isn't to say that some dogs (or people, for that matter) won't have an allergic reaction or get sick if they eat enough leaves. The only one in the salvia family that I know of that's hallucinogenic is Salvia divinorum.
Also, are all Salvias psychoactive?
Most common forms of Salvia can be found in plant nurseries. They are not hallucinogenic and will only give users a headache if smoked. Diviner's Sage, Salvia divinorum - commonly refered to as "salvia" - is one of the hundreds of species of the Salvia genus.
Sage flowers are definitely edible. In doing a search for "sage flower recipes" on Google, I came up with more references to pineapple sage flowers than anything else, but they are all edible. Sage leaves can sometimes be quite bitter, but often just taste like a mellow sage leaf.