Tim,
You wrote:
"I am aware of the definition, and had no business asking one of your experience and knowlegde to clairify himself, sorry."
My very dear sir, this is the very place to ask these questions, and no apology is ever needed! I am pleased to offer what advice I can. Always remember though that for every grower, there are a new set of conditions, and all advice is just opinion based on observation. Even the Masters can only speak from the limits of their own conditions, and what works in one instance may not in another.
Observe your own plants carefully and they will tell you what they like and want.
In this case, the information I have received from other growers served me well, but it has not always proved to be so.
In my conditions, both P. primuliflora and P. planifolia appreciate very wet substrates. I grow the other N.A. temperate species (lutea, ionatha, caerulea and pumila) just moist in the growing season, and less so in winter.
It seems rare for plants to continue for more than 5 years or so, at least for me. A regular program of propagation is needed. For me, only P. primuliflora form plantletts at the leaf tips. I have not experimented with many leaf cuttings of the N.A. species, but I have had little success with my attempts at this, and I rely on seed to keep the plants in my collection.