Organic gardener growing food and flowers, lovin' pollinators and birds.

The Gardener's September Calendar

Keep harvesting veggies to encourage plants to keep producing until frost.

The main thing to keep in mind this month: The gardening season is not over yet! There's a lot that can be completed this month, including creating raised beds and editing current garden beds. You can also sow more vegetables that will grow quickly before the temperatures dip. Here are some tasks on my list this month:

  • Trellis ramblers — Are your raspberries and blackberries out of control? When I visited California to be a #NGBPlantNerd for a week, I came across a staking technique that I fell in love with! Most often used for indeterminate tomatoes, I also spied it being used to control blackberries. Take two fence posts and use string to "Florida Weave" or basket weave the plants in position. (Not sure what that process is? Here's a video I found from The University of Maine that explains how it works.) 

  • Plant for fall — Many vegetable plants that like cooler temperatures — such as lettuce, kale, peas, beets, radishes, spinach, carrots — are perfect for planting now in cold frames or raised beds where frost covers will be used for protection. Look for varieties that will mature within 30 days. To keep flying pests off, use a floating row cover (install this when you plant). Speaking of planting for fall, instead of buying grocery store mums (which are usually grown in hot houses and won't survive harsh New England winters), consider adding asters, perennial mums, and grasses to your landscape. Pots can be refreshed with decorative kale and ornamental pepper plants, too. 
  • Fall cleanup — It seems as if it is never too early to start cleaning up the garden. In this previous blog entry, a master gardeners offers tips to make fall cleanup faster. Anything that is diseased should be chucked into the garbage can (think tomatoes showing blight, irises showing borer damage, etc.). Any spent flowers should be cut back (deadheaded). However, leave perennials like echinacea standing so they provide seeds for the birds and hollow stems for native bees to overwinter in. (We'll talk more about that next month.)
  • Daylilies — Now is a good time to divide and plant new plants in the garden. Bonus: If you are starting a new garden bed, when you are planting bulbs this fall, plant daffodils underneath your new daylilies.  The emerging daylilies will hide the daffodil leaves as they yellow in the spring. Learn more about growing daylilies in your garden
  • Irises — You can still divide bearded irises into September. This is important for older clumps of irises that are no longer blooming as well in the spring. Cut off any rotted or damaged rhizomes, and replant them so the rhizome is only half buried.  (Think of irises as tanning salon freaks. They like their sun exposure to keep their rhizomes from rotting.)
  • Bulbs — It's time to place your orders! Break out the photos you took in the spring and figure out which parts of the garden are missing spring color. The trick is trying to get a continual cycle of bloom. This year I'm going to be focusing on more minor bulbs (think crocus, snowdrops and grape hyacinths) to create larger swatches of color.
  • Garlic — If you didn't set aside some bulbs from your harvest earlier this summer, make sure you get your order in soon for garlic bulbs to plant. In my area, we plant in early to mid-October.
  • Divide perennials — This is a great time for dividing vigorous growers in the garden. But it's OK to put plants in the compost pile if they no longer have a home in your garden. If you are more ambitious, check out these late-summer garden design ideas, as covered in a previous story for the blog. 
  • Lawn care — Now is a great time to reseed the lawn. Cooler temperatures in autumn help grass seed sprout faster than in the spring. In this previous blog entry, Diane St. John of Natureworks explains how certain weeds can act as clues for diagnosing problems in the lawn. I am planning to redo the small lawn portion I still have in my back garden, but first I need to remove the weeds and do a soil test. Speaking of...
  • Soil tests — Did plants not perform as you had hoped this past season? Time for a soil test! The fall is a great time to start amending soil so your garden will be ready for planting in the spring.
  • Cuttings — Did you love your huge geranium this summer but there's just no place to store it over the winter? Take cuttings now of annuals so you can have the same plant for next spring. This can be done with either rooting powder or by placing cut stems in a small vase of water to root. (Coleus is especially easy to root in water. I've had luck using rooting powder on geranium cuttings, too.)
  • Hummingbirds — Keep feeders supplied with food for migrating birds.
  • Display your flowers — Need ideas for what to do with all the flowers blooming outside? Here are some design ideas that pair in-season blooms with pumpkins and falling leaves.
  • Journal — This is an especially important time to write notes about what worked and didn't work in the garden this year. The notes that you take now will be useful when you experience spring fever in February. I find that if I am not specific about what worked and didn't work, or if I do not list the ideas that come to mind, I tend to overshoot my goals in the spring. So an example would look like this: "Given how dry the last two summers has been, I think I really need to start investigating drought-tolerant plants for the garden. I learned that cleomes really don't like the front street border where it is very dry, so I need to stop trying to make them grow there."
  • Collect seeds — Start collecting flower seeds for use next year. Think cosmos, zinnias, calendulas, daylilies and snapdragons... to start. After harvesting, keep them in a cool, dark place. I store mine in paper bags to start. ("Starting & Saving Seeds is a great resource for how to save several different types of flower and vegetable seeds.)
  • Future beds — One of the easiest ways to start a new garden bed is by hoarding cardboard, and then laying it on top of the ground where you want a new planting area. Put mulch and shredded leaves on top. In the spring, you'll have an area ready to plant, thanks to your garden's beneficial insects. This can also be done for new pathways: Lay down cardboard and cover with mulch. Done! 

I garden in Zone 6b in Central Connecticut.
Original post: Sept. 3, 2020. Updated Sept. 12, 2021.


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