TIP # 1 Houseplants that have been outside all summer should be allowed to make a fairly slow transition to indoor conditions. Quick changes in environment can result in yellowed foliage and leaf drop. To avoid injury, bring plants indoors before temperatures dip below 55 degrees. Check for insect pests before you move the plants indoors; it is easier to get rid of pests while plants are still outside. Stop in for Bonide Systemic Insect Granules for houseplants.