There is Jerry Baker - master gardener, who wrote books on plant care w/ many home remedies, & he says to pour leftover coke & beer -- NOT DIET coke, on your plants. Or, to make sugar water & pour that on outdoor plants. I did this to my lilacs & some indoor plants & it did not cause any problems w/ insects etc. Sugar is good for plants.
Jerry Baker, America's Master Gardener: Tips and Tonics