Just to toss in another twist, my Brit friend who has lived in Thailand for 30+ years, and is passionate about orchids, says he feeds his adeniums 6-30-30 orchid food at 1/4 to 1/2 strength. His adeniums are very mature plants and are some obesum and some arabicum. All are grown in large pots and are very impressive in both form and flower production. Of course, he has an entirely different set of growing conditions. I'd have a high level of anxiety about 6-30-30.
