The only plants that can live and grow without being directly watered are called epiphytes. Some common ones grown as houseplants include:
Ferns, especially Staghorn ferns
Bromeliads, especially Spanish moss,
Jungle cacti, like Rhipsalis
Orchids, (Cattleya and Cymbidium come to mind)
All of these plants, however, require light, preferably right filtered ...
A greenhouse should have roughly 50-70% humidity depending on what you are growing. Yes your humidity is far too high. As far as throwing the thing away I would say no. It is still perfectly usable with a little bit of innovation. If you are interested in a fun project, I would suggest you ventilate your greenhouse.
Here is a video on how to cut holes in ...
It's likely to do with the lighting, or the heat from the mat, or both - the last seedling looks as if its been burnt a bit. I don't know what part of the world you're in, but it seems like its time to remove the apple seedling from that light and place it near a bright daylight source, like a windowsill, gradually uncovered, until you can harden it off to ...
(merging @Bamboo's, @J-Musser's and @treeNinja's answers to a community wiki)
Plants suitable for high humidity:
UV light source should be timed.
The plants should be placed within close proximity to the UV source, to avoid using high power lighting.
On top of a ...
If there is no natural light of any description in your bathroom, I'm afraid that means a plastic plant - all living plants need light, even shade loving plants, so unless you substitute a growlight in your bathroom and leave it on for the required number of hours, fake plant it is. Which also, of course, won't need watering...
So you are saying you have a ventilation system to pull air out of the room...do you have a way for fresh air to be pulled in passively? Fans are critical for all indoor and greenhouse plants. Do not worry, moving air has few if any negative effects for your plants. Unless the plant is being moved in the back of a truck going more than 30mph, now that is ...
Plants can suffer leaf burns when transiting from very moist environment to drier air, just like how leaves will burn when switching plant from shade to full sun. At least that is what will happen to old leaves that started out in the previous environment, however new leaves emerging in drier air or full sun will usually have no problem with such dryness or ...
They do like humidity, but low humidity isn't fatal, and you can get quite a decent crop without it. What is important is:
high soil temperature
high soil moisture
high soil fertility
high soil organic matter content
high light levels
loose soil texture
Adding compost is good, the more the better, even if you end up with almost straight compost. Keep in ...
Would there be indirect light from a window or would the only light be from a bathroom light fixture? Some light is important.
Pothos come to mind because they can handle higher humidity and do not require a lot of light. The an survive in a small pot with some dirt but grow quite long and large. Look for dark rich green leaves.
Orchids also love ...