Hi,
While I am not an expert by any means...I have had orchids for years including several "rescue" orchids given to me over the years by friends...since I seem to have a green thumb where they are concerned
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I purchased my first Masdevallia...Masde Dean Haas 'Embers' from Graham @ Lehua Orchids in Hawaii....I figured if it was blooming and growing there I'd have a better chance of succes since our climates are similar (I live in Florida) so my first suggestion is to locate a grower with a similar growing environment to the one you will be providing....ask the grower to make a suggestion as to which ones would be the best to start out with. Graham also has a great article on his webpage about growing Masdevallia's!! This Dean Hass was in bud when it arrived from Hawaii....and has been continuing to throw up spikes everywhere (so it's been in bloom for months!!) and has tons of new growth so it seems pretty happy
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My Masdevallia is growing indoors on a windowsill next to several Phals...as there light requirements are very similar.
I do use R/O water, as my well water here is very hard, and follow the weekly weekly fertilizer routine.
Mine isn't planted in Moss....it is planted in Orchiata Bark...this is a slightly drier medium and allows for good drainage. I water when it begins to dry out....sometimes when the heat/AC has been on this can be a daily thing...sometimes it can be only a couple of times a week. I use feel to judge how damp/dry the medium is. The only special thing I do for it is the R/O water and I also mix up my fert using R/O water as well. I open my windows when temps allow...for additional air circulation. believe most of the information I have read suggests that hybrids are more forgiving and temp tolerant than species, and the cool pots are great....I have some here but haven't been able to re-pot mine in one since its been continuing to bloom/spike
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Hope this helps!
Kathy
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