The leaves are starting to turn and soon will begin falling in earnest. Leaves make a great organic mulch for your vegetable and flower beds. However, don't just leave them where they drop. Whole leaves can become matted and suffocate your yard. Rake them from under shrubs and rake or gather them up with the bagging attachment on your lawn mower. The attachment will chop the leaves for you but if you don't have one, rake them into a pile and mow over them with your mower. Add the chopped leaves to your beds. They help to insulate roots, enrich the soil and retain moisture.
Lots of herbs like the cooler weather. Plant Italian flat leaf parsley, which has a stronger taste than the regular curly parsley, and rosemary in pots on your patio. A couple of cold-resistant rosemary plants are available. If you can't find them, you can always bring your plants in when the weather gets especially cold.
If your butterfly bush needs to be trimmed, it can be done now, during the winter or in early spring. Just like crepe myrtle and rose of Sharon, the butterfly bush blooms on new growth so you don't have to worry about removing flower buds now. Taking out the oldest and woodiest branches will result in more flowers next summer.