Dude, I have not experianced mites on plants... but if these are the same kind of mites that animals especially snakes get, then you need to go to your local mom and pop pet store that deal with reptiles, and pick up some mite stuff, you spray it where ever the mites bed down (especially carpet) and it kills them quick.
I bought a 9 foot burmese python from a lady a few years back, and she had been bedding the snake in hamster type wood bedding, and the bedding helps promote the mites.... The snake was covered and all... so I went to my trusted herp store and bought soem stuff in a spray bottle, sprayed the snake and the bedding, then replaced the bedding once there were no more mites on the snake... very little black specks -- the mites I mean...? thats what my snake had... stuff worked great...