Natural light can also be supplemented with artificial light. Plants can be placed near lamps that are allowed to remain on all night. Special plant lights with higher light intensity can also be employed.
Plant leaves accumulate dust. Leaves of many plants can be cleaned with a solution of mild detergent. Water will spot most fuzzy leaf plants such as African violets. If you are not sure whether water will damage a particular plant, clean one or two leaves and wait a couple of days to see if there are any adverse effects. Leaf shine products will also clean leaves. If plants become odd shaped because leaves are turning toward the light, rotate them a quarter-turn each week.