Hi:

I have some polythricum commune that I've ben growing successfully for about a year and a half indoors in a pot under a bell jar, which has developed grey webbing which looks like it may have tiny mites in it. It's pretty touchy (I only water it with rainwater) so I'm a little concerned about washing it the way I normally would with this kind of infestation on a normal house plant. Does anyone have any advice for getting rid of this, and any tips on keeping it from coming back? Thanks!