Falling leaves signal the beginning of the fall garden clean up season. Fall is a great time to plant trees and shrubs, cut back perennials, remove annuals and get your lawn healthy for next spring. Remember to keep watering. Trees and shrubs that are deprived of water now will be easily stressed in the winter. Below is a handy guide to fall clean up tasks, vegetables to plant, flowers to plant, when and how to start and finally when and how to harvest.