Now we are staring autumn directly in the face and we need to start planning. You can create a stunning border by using plants that look good during the autumn months such as Japanese Anemone. These need full sun in a well-drained soil and you can divide these every so often. Other plants which you should consider are the ornamental grasses, viola and perennial asters.

If you want early sweet peas sow them in cold frames, greenhouse or a cheaper alternative on a windowsill (inside not the outside).
Buy spring-flowering bedding plants, such as Polyanthus, Pansies and Violas.
Now is the time for some long term planning, well for next spring at least. Planting Pansies in borders or containers will give you a resplendent display next year. If we have an Indian summer turn to the iced squash (or pimms on the veranda) if so inclined once you have got these planted up. Failing that a hot chocolate if the rest of the year is anything to go by.
Unfortunately those chores still need doing and here I am thinking of deadheading which is removing faded flowers from perennials and annuals to ensure a continued display of blooms.
You can also look out for greenfly and treat with a suitable insecticide (available from garden centres and other quality shops!).
Most perennial weeds are vulnerable to weedkiller in early autumn. Applying a product containing glyphosate will ensure that the roots, as well as the top growth, are killed. However some plants such as couch grass may well be stimulated into a new flush of growth as glyphosate works kills back from the root tip and as it runs out of steam will trigger new growth from dormant shoots on the rhizome. But the plant is weakened and a second application in the Spring will usually wrap up proceedings.
You may appreciate the next tip. Powdery mildew can be a problem in dry, warm Septembers. (Picked yourself up from the floor yet?).
Did you think I was not going to mention your lawn this month, wrong now is the best time for sowing new lawns. You can now start to think about autumn lawn care, including scarifying, aerating and top dressing with an autumn feed high in potassium to harden up the lawn for winter.
Earlier I mentioned deadheading but if you are interested in wildlife in your garden eave some flowers to develop seed heads, rather than cutting them back, to provide food and shelter for wildlife.
Remember a variety of insect-friendly planting from all these groups is likely to attract more insects than a mass planting of flowers providing only nectar or pollen. ‘Til, October!