Trees and Shrubs:
Fertilization using a good granular fertilizer with slow-release nitrogen should be done at this time. This should be broadcast in the root zone around the drip line of the plant.
For conifers, this is their dormant period and they will cast off their oldest needles. Do not mistake this for a disease. Conifers also require plenty of moisture to get them into shape for winter. They will require one inch of water weekly until the ground freezes. Supplement rainfall to be sure soil is charged.
Perennials will have to be divided every three to four years. This is a good time to dig and divide perennials and replant them. Leave at least two stems per division or divide into two equal parts. Move extra plants to new beds or discard them. After replanting, fertilize with a 4:1:2 ratio fertilizer at a rate of one pound per 100 sq. ft.