What To Do in the Garden in September

September is a perfect time to enjoy the harvest from all your hard work and to relax in the last of the summer warmth as the first official month of autumn arrives. A warm September may see the flowers in one last bloom, but regardless you will still see plenty of colour left in the garden. Gardening jobs in September involve planning, preparation and reaping the benefits of your vegetable patch as well as planting bulbs ready for the following year.

Encourage those flowers to bloom again by taking a look at a few of the things we recommend that you focus on in the garden throughout September.

What To Do in the Garden in September

Plants and Flowers:

  • Begin planting early spring bulbs like Daffodils, Crocus and Hyacinth ready for next year.
  • Continue to deadhead hanging baskets and flowers as you can continue to get new growth and blooms up until the first frosts.
  • Deadhead and cut back perennials and annuals, in particular Roses and Dahlias.
  • Prune and cut back climbing roses once flowering has finished unless you have purchased repeat flowering varieties

Lawn Care:

  • As growth slows continue raising the height on your lawn mower blades
  • Aerate the lawn with a garden fork to prevent water logging in the upcoming rains
  • Seed and turf new lawn in areas that need it as damp autumn conditions are perfect for new grass
  • Switch your lawn feeders to autumn fertilisers to prepare your grass for the upcoming winter. A good product for this is Miracle-Gro® EverGreen® Autumn Lawn Care which will help protect your lawn during the upcoming colder months.
What To Do in the Garden in September

In the fruit and vegetable patch:

  • Continue with your harvest. If you find that you have excess, try freezing, pickling and making jams to make the best use of your harvest and you can continue eating them throughout the winter.
  • Cut off the foliage of main crop potatoes to ground level a good couple of weeks before lifting. This helps to prevent blight spores infecting the crop and firms the skins of the potatoes.
  • Spread your newly harvested potatoes out to dry before storing them in brown paper or hessian sacks in a cool dark place.
  • Help those Pumpkins ripen by removing any leaves casting shade on the fruit.
  • To reduce rotting of squash and pumpkins, keep them off the ground by using wood or plastic.
  • Cut bean and pea plants away at ground level when they have finished cropping. Leave the roots, as these will slowly release nitrogen back into the soil as they break down increasing the fertility for next year.
  • Remove straw from the base of your Strawberry plants and rotting fruit in order to prevent disease.
  • Pick ripe apples and plums and black berries for the last of the harvest.

Pests and Weeds:

  • To keep the pigeons and local wildlife off your remaining fruits and seeds, protect your crop with netting and scarecrows.
  • Increase preventative methods for slugs and snails as the weather becomes damp. Beware of using pesticides if you have pets and always read the product instructions before use. At Holt Garden Centre we are proud to stock a range of pet friendly pesticides, please ask in store for these specific ranges.
  • Continue removing weeds, particularly at the base of shrubs and plants, to reduce competition as the plants begin to die back
What To Do in the Garden in September

Watering Tips:

  • As September can still bring warmer temperatures, maintain good moisture levels throughout the month by watering less often but still thoroughly.
  • If the month is particularly mild, watering in the evening helps the soil to retain moisture.
  • Continue watering thoroughly up until the first frosts.


  • Clean out your greenhouse ready for autumn sowing and trap heat overnight by closing windows and vents each afternoon.
  • Create compost areas for upcoming falling materials.
  • Start to raise pots off the ground using pot feet to prevent water logging.
  • Burn and dispose of diseased material to avoid any spreading. This should not be composted.
  • Order spring flowering bulbs if you haven’t already.
  • Late summer and early autumn is a great time to collect seeds ready for use next year. Collect any seed heads and pods and store in a cool, dry place.

Something for the little ones:

Plant early spring bulbs together like Lilies, Allium, Daffodils and Snowdrops. At the Holt Garden Centre, we stock a wide range of children’s gardening products perfect for getting those little fingers green at an early age.

For more information about preparing your garden from the autumn, or to view our latest in stock seasonal plants do not hesitate to visit Holt Garden Centre. Open seven days a week, we can provide you with all the necessary equipment and plants to keep your garden looking its best even as the weather begins to change.

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