As you may well know, I torture my plants something awful. I leave them outside in the scorching San Diego sunshine, and water them once a week (in a cocoa chunk + lfs with some perlite mix) without misting them except for with neem if I see any bugs.
I've bought plants from the U.S. as well as overseas, and some people aren't so terrible with their plants, so I need to acclimatize my new plants to their new home so they don't go into shock and die. What is my technique? Here are some pictures with explanations to follow:
Number one: ICU Heli tank (from a high-humidity grower, small plants for the most part). You see that I have an aquarium/terrarium, helis sitting on "egg crate" trays, and a large glass plate on top. There are egg crate trays to increase the volume of water (more water = holds cold longer/better...), and the helis sitting in water is to ensure that their roots are in contact with the coolest thing I can provide (cool water). There are tall sides to the terrarium so that while the humidity is being created from the body of water, it *has* to either sink back into the water, or rise up out of the terrarum through all of the heli pitchers, thus creating more humidity for them. The glass plate is on top, and *round* for a reason: trap the humidity in, but leaving the corners of the terrarium free to exchange air so I don't grow mold and rot everything in the terrarium. It keeps a good lot of humitiy in, while allowing for air exchange, but I have to watch for overheating (set a fan on if you put it in bright lights/the sun otherwise you'll broil them alive!!!). I started out misting it twice a day with the plate on top for a month...the past two days I misted about 5X a day leaving the container exposed without the plate on top (it was the weekend) and I left them uncovered all of today with just 2X misting and they appear OK so far. I'll be leaving them uncovered but misting 2X a day for the next couple of weeks. Also, I let the water level in the bottom reservoir drain free from the helis once every week or two to ensure that their roots get drained every now and then (either by evaporation or tipping the terrarium at an angle to either side for a couple minutes).
Number two - various plants in different stages of humidity retention. Starting from the left - bagged hamata that has been in my care for around a month, so the bag is mostly open on top already so it gets slightly higher humidity, but not really much condensation. Second from left - plant that just came in from Hilo, Hawaii so I assume it's used to sopping wet. It's in a mostly-closed ziplock bag because i hear the person grows outside so the plant isn't as soft as ex-vitro by a day, but still not up for my climate quite yet. If it just came as a soft ex-vitro plant, the ziplock bag would be sealed leaving a 1"X1" hole on top for air exchange (and I'd air it out while misting it down once a day in the morning most likely..). Third from left: ceph root cuttings. Have a bag on top, that's what the closeup in the third pic is, small hole on top to make sure it doesn't mold and roast, but otherwise pretty saturated with humidity. I take the bag off every 5 days or so to check to see if anything's sprouting. Third from right: nep basal cutting, sitting in a saucer of water in lfs : perlite, with a deli cup overtuned over the pot with holes cut in the upper corners for air exchange (and because it's square, the upturned-top of the container has air holes too from beneath the "soil" line). I plan on letting the plant soak up all that water, leaving the tray dry for a day, then refilling it. I won't be taking the dome off anytime soon until it starts growing again. Second from right: heli growing in the same setup as that nep basal...that's its permanent habitat til I free up some room in the heli tanks. Also in sitting water...I lift it out and let it drain once a week, but it's always sitting in water. I spray it down now and then, but it doesn't really need it I think. Rightmost: rightside up deli cup, filled with some water on bottom, housing a small sundew that likes it hot and wet. It provides an inch of walls around the pot through which humidity can rise and surround the plant, but it's pretty free to breathe. I've grown small helis this way and they do fine.
3. non-ICU heli tank, these just grow on egg crates submerged a little in water, same mix (lfs : perlite), and don't really need misting. The sides of the terrarium provide sufficient humidity-storage that this can grow outside on my balcony when it's not threatening to be 80's outside. My moss looks great in this - I'm even starting some sheet moss on a cork slab to make it look prettier!
I guess this should be in general discussions, but most of the time people are most worried with acclimatizing soft TC clone neps, so I thought to post it here.