My daughter has spider mites on a clementine tree she has been growing for a few years from a seed. She thinks they came into her home about a year ago on a fern that was infested. She has moved the fern outside and will get rid of it this fall, but would really like to keep the clementine tree which is now about 4 ft. tall and seems pretty healthy. What can she do to get rid of the mites? Will they spread to other house plants? She has some succulents, clovers and wandering Jew (spiderwart?). Also, is it true that even if you get rid of the plants, you shouldn't buy new ones for at least a year or two or new ones will get the mites when you put them in your home? She says she sees webs on the other plants and even on fake flowers. Are those from spider mites? Or maybe other spiders? Thank you for your help.