To protect the landscape from future insect and disease problems, it is suggested to rake up fallen foliage and remove it from the landscape. If plants were infected with black spot, other diseases or insects, remove the foliage, directly take It to the trash bin and don't even risk composting it.
Excessive weed growth in late fall and winter can contribute to next year's pest problems, so it's important to remove weeds from the landscape as soon as possible.
Weeds also can provide food and shelter for overwintering insects. And, don't forget about all the seeds they will produce to plague you in the future. Get rid of the weeds.
Another important thing to do for landscapes in the fall is to apply mulch around perennials to protect them from winter temperatures. Most perennials will die back after the first few frosts and the foliage can be discarded to the compost bin if they were not heavily infected with disease. When the foliage is removed, make sure there is a shallow mulch layer around the base of overwintering perennials.
Spring flowering bulbs laying dormant under the soil will also benefit from a layer of mulch. Mulch is not really to keep the soil warm, but to keep the soil temperature even. So wait until the soil temperatures have cooled a bit in mid-to-late fall and then apply a few inches of your favorite organic mulch such as wood chips, or bark or compost.
Mulch helps shade the soil and moderate soil temperatures and may help prevent heaving of shallow-rooted perennials from the soil.
Just remember that there is still a little work to be done after the first frost of the fall. You'll be glad you took the extra time to prevent problems in the future.
Lieutenant to private: Hey, soldier, why are you carrying only one bucket while everyone else is carrying two buckets?
Private: Sir, I guess those other guys are too lazy to make two trips.