I have my Fritz hanging in a southeast window. I have it in Orchids Ltd. rockwool and perlite mix. It’s doing well with a new growth half mature now. I was worried about watering with kovachii in the mix and it was my first Phrag in 12 years so I watered with distilled water for a while but now I’m watering with filtered. Kelpak and MSU for fertilizer. Water twice a week. It’s getting hot here so keeping an eye on keeping the roots cooler right now for my besseae and kovachii hybrids. Happy with the growdan so far for the Phrags that like it wetter and cooler. Temps in the house are under 80 generally. My kitchen is lucky that it has amazing windows, two air vents, and a ceiling fan so I’m hopeful that this room will also get cold enough in the winter for the kov. hybrids.
So far I’m happy with the progress but will see how things turn when we get over 100 outside this week. Had to move a few hybrids back from the hot window a bit yesterday. Have a few other kov. hybrids now and I’m treating all the same way. My long petaled Phrags are in bark mix but otherwise same culture.