I was recently asked for the following information, so I decided to share it with everyone:
P.S. Some species respond favorably to the addition of coral sand, but not all. Piinguicula gypsicola is one that does.Originally Posted by (PinguiculaMan @ Aug. 30 2006,5:00)
Additional comments: Whenever growth appears to be slowing, I dust the leaves with dried insect powder, then spritz the leaves with a little 40ppm fertilizer solution.
If you haven't realized it by now, I am a tinkerer. I am constantly thinking up new things to try, so that my cultivation and propagation success might improve. Some things have helped, some haven't. I have just recently discovered the benefits of this new media blend, I had used it with a few different Mexican species, they had developed root systems that bound together a one-inch deep plug of the media and most of these roots were still alive. Ordinarily in an organic-rich media, though the plants appeared very healthy and were growing well, upon removing them from the media it became apparent that they had virtually no root system to speak of. Except for a few roots about 1/4 inch long growing around the perimiter of the "root ball", the central roots were usually all dead and rotting. I have not yet converted all, or even most, of my Mexican Pinguicula into this media, but, all those so far transferred have responded very well. I must give credit to Pyro and Eric for their contributions to the idea of using a mostly mineral media.
I've come to realize that by using fluorescent lighting I may be providing more of the UV levels these plants are used to in their natural habitats and this may be part of my cultivation successes.
For details of variations in UV radiation reaching the earth at various altitudes and latitudes, here is a link to one source: U.S. EPA.
For example, the expected UV exposure in Oaxaca, Mexico is here. I compare that with my local UV, here at Tucson, AZ. I consider my exposure here in Tucson to be high, and it is, but nothing like closer to the equator or at high elevations close to the equator. Anything North of our latitude is significantly lower in overall UV exposure.