As we move into the winter, your plants will require only moderate watering - no more than once a week. Plants can also hide unwanted stowaways as they're brought in. While they are outside, pests are controlled by a number of biological controls but as soon as you bring them indoors, YOU become the only pest control method. Check all of the leaves and if it looks like you have some insect activity, spray the plant with soapy water or insecticidal soap and make sure to spray both the top and underside of each leaf. Keep the plant out on the porch until you're quite sure you have killed most of the pests.
Most houses have quite dry, warm air which can also encourage spider mites.
Wash the leaves well under a strong stream of water to dislodge them and keep the plant well misted to increase the humidity. Insecticidal soap will also help keep these mites under control. Finally, if any of your plants were in pots outdoors, make sure to lift them out of the pot and check for slugs. Slugs will often enter plant pots through the drainage holes and lay their eggs at the bottom of the pot. The young slugs will then nest quite happily in your pot, feeding on the roots as they need nourishment.