Seeds from open-pollinated plants can be saved and stored for the following year.
After the leaves die off but before the first frost, carefully dig up frost-sensitive bulbs like dahlias, caladiums, cannas, and begonias and cut the foliage back to a couple of inches.
Work in 2 to 3 inches of compost to refresh your beds for new plantings. Do a soil test, if needed (your local Extension office can assist with this), and add in any nutrients that your soil falls short on.
Remove any dead or diseased leaves and spray the tops and undersides of leaves with water to dislodge any hitchhiking pests and their eggs.
Shut off the main water supply and remove the faucet assembly at the start of your irrigation system. Have underground watering systems winterized (blown out).