A cover crop can be sown on the vegetable garden then forked under next spring.
Add bonemeal to soil when planting hardy bulbs.
All Narcissus should be planted by the end of the month.
Bulbs of Chionodoxas and Scillias that are overcrowded can be dug and replanted.
Burn all diseased leaves and plants to prevent spreading the disease.
Check Lilacs and Phlox for powdery mildew.
Do not prune Roses now.
Divide daylilies and other spring blooming perennials.
Fall is one of the best times to apply fertilizer to lawns.
Feed Aconites liquid manure before they bloom.
Feed Peonies wood ashes and water well, as the eyes for next year's growth are forming now.
Finish planting new lawns or reseed thin patches in established lawns.
Fruit harvests are coming: apples should be allowed to ripen on the tree, pears are picked before they ripen.
Fuchsias growing in open ground can be potted up for bringing indoors.
Hydrangeas lifted from the garden can be put in the cellar until January.
Keep Dahlias and newly planted evergreens well watered.
Lift and store tropical waterlilies.
Move house plants indoors so they can adjust before the heat is turned on.
Plant some bulbs where the sun touches in February for early blooms.
Pull out spent annuals and add them to the compost pile.
Pick up self-sown seedlings of Foxglove, Pinks etc. and move them to the cold frame.
Select some hardy spring blooming bulbs for fall planting.
September is the ideal month to lift and divide Peonies.
Spray Roses again for mildew and black-spot control.
Start mowing new grass when blades are about 2 inches long.
Thin and replant Lily-of-the-Valley.
This is the time to dig and thin Crocus bulbs.
Transplant chrysanthemums to boxes and planters for October blooms.
Watering is just as important in September as it is in spring.
When the leaves of deciduous trees and shrubs begin changing color, from then on it is safe to move them.