You can spray with insecticidal soap, or even mix your own. One teaspoon-
tablespoon Murphy's Oil Soap per gallon of water. Make sure whichever
product you are using that you water the plants well before spraying. Some
plants with fuzzy leaves may be a bit more sensitive to sprays, so use
caution, or test first. Even lightly hosing the plants from top to bottom
can spray off insects and debris before the move indoors. If you know of
real problems--spider mites, scale, etc., then you may want to have a
"hospital ward" before moving these plants in with the whole group. I would
consider throwing infested plants away unless they are really valuable to
you.
(October)
Is there a solution I can mix to spray (or water) out door plants to rid them of
insects before I bring them in for the winter.