September Tips and Tricks

September and October are my two favorite months of each year. These two months tend to remain on the dry side with sunny skies yet have cooler weather than either July or August. September is also Summer’s last month, and I think it is the best month of Summer. Take a moment as you walk, jog, or drive to enjoy the slow change of the seasons. The rainy season will be with us soon, usually by the end of October. The transition here in Western Oregon from Summer into Fall is so different than the transition between Spring into Summer. Spring’s entrance is often a furious fight between the chilly, wet days of Winter and the warmer, sunnier days of summer. That competition often includes storms, frosts, winds, sudden heat, etc. Fall’s entrance, on the other hand, comes upon us with a slow, cooling, gentle slide into the rainy season and then on into the even cooler rains of Winter.
September Gardening Tasks:
- Slack off on watering in the beds, but check to see and water if your soil is dry. Less water now hardens your plants off for Winter.
Weed. Yes, keep doing this! Never give up!
- September/October are the best months to plant new or renovate old lawns, particularly as the air gets cooler and before it gets cloudy and cold. You may want a landscape company to perform this task for you.
- Bait for slugs. Remember the beer option, and if you do, bury something like a mason jar in the earth and fill it with beer to 1” below the lip. That way, the slugs won’t be able to lean in and get a sip but will instead fall in.
- You can begin trimming off the tops of those perennials that have finished blooming and have turned brown; this will help to clear up the clutter before Winter arrives.
- September through March are the best months of the year to transplant or plant. The peak month for planting and transplanting is November.
- Pick and store winter squash when it is ready, usually in late September.
- Keep picking tomatoes and potatoes.
- Early September is the last month to plant your winter vegetable garden west of the Cascades. Examples are winter hardy kale, Brussels sprouts, Italian greens, broccoli, raab, turnips, cabbage, kohlrabi, and more.
- September is also the final month for regular summer lawn fertilizer application (use a unique Fall/Winter mix for November).
- Now is an excellent time to take Rhododendron cuttings to start new ones if you are so inclined.
- This fall, prepare your compost piles for recycling vegetation from your gardens and deciduous trees. Read this blog post for a more detailed look at what makes good composting.
- Use a copper spray for peach and cherry trees during dry periods.
- If you are prone to these diseases, spray for bacterial canker of blueberries, leaf cane spot, and juniper twig blight (after pruning away dead and infected twigs) during dry periods.
- If the nights get too cool outside, bring houseplants indoors after cleaning and re-potting them. Keep them out, though, through October.
Short Blog on How to Over Seed Your Lawn:
- Generally, the best time for overseeding (filling in bare spots) or grass seeding is September/October/November or March/April/ May.
- Scratch/rough up the bare areas in the lawn with a stiff rake.
- Sprinkle some seed over these bare areas with just a little natural fertilizer and lime. Cover it to no more than ¼” deep with grass seed mulch. This looks like straw but does not have the weed seeds straw bales have!
- Keep the area moist but NOT soaking wet. Give it lots of spritzes on hot days and just a few on cloudy days.
- Wait about two weeks to see what happens. You are doing well if tiny green shoots, like green dog hair, begin appearing.
- If no green appears—or not enough to create happiness—repeat the performance every three weeks until you have grass.
- Keep the bag of grass seed in a cool place (like a garage) over the Winter. In the summer, put it in the refrigerator. (Watch out for rodents; they love the stuff!)
- Remember that overseeding a lawn regularly here and there in damaged areas is just a part of the life of owning a home with a lawn.








