Those look like Dr. Studnickas plants, am I right Arie? I found a local tufa deposit, and hiked back out of the woods some 2 miles or so las summer with about 40 lbs of tufa rock and marl sand. I have gome P. vulgaris, P. balcanica, P. grandiflora and P. macrocerus gemmae to try on the rock this spring. I plan on rigging a drip system, and will keep all posted of the results (if any). This is my first venture into temperate european Pinguicula, and I am aready nervous abo ut it. If anyone has some good advice, I am all ears! I really am curious about maximum highs and light levels. I know these plants are all cool growing alpines, but am uncertain of just how much heat they can take, and still survive.