You want to make sure that what you bring indoors are the plants and not unwanted hitchhikers. Before moving plants indoors, give them a good shower. Use the showerhead nozzle on the hose and be sure to spray the undersides and tops of leaves. Pay special attention to where the leaves attach to the stem to make sure no tiny insects are hiding in any crevices. Give the soil a good soaking, too.
Keep the plants you are moving indoors separated for a week or so from those that stayed inside, if you are worried about possible insect or disease contamination.
