Well, I used to grow everything in Promix, but I found out that moss works best for the smallest plants, Orchiata seems to work best for plants in 2 in to 6 inch, but after that things become unpredictable. Wet bark, even Orchiata, doesn't last very long and sometimes when I repot, it is a big fungal mess. The roots are still OK, but it looks disgusting. Also, I often see the roots lifting out of the pot because they can't push through the bark. That said, I try to use bark as long as possible. Sometimes it is seedling bark and sometimes it is the next size up, but for many large plants it just doesn't work very well. This is when I switch to Promix HP with a little extra perlite. My very largest phrags are all in Promix. I water every 2 or 3 days and wash out frequently to remove accumulated salts. My greenhouse is a little on the bright and dry side, and sometimes is a little too hot. I do not have any of my phrags standing in water, except when I am away for more than a week or so. This seems to work for everything I have including kovachii, and I have received a CCE on one of my big phrags growing in Promix. However, I must admit that I have less success with the long petal species, and I have a strong feeling that I could be doing better with everything, if I could just find the right combination. I am going to be running some experiments with large plants in Promix vs Bark vs Grodan + Hydroton for about a year. I will probably switch all of the big ones over to the one that works best. Mike