Garden tasks for September

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  • Plant out summer annuals like salvias, marigold, bedding dahlias, gazanias, alyssum, dianthus, and mimulus, water twice a week and fertilise with a liquid fertiliser once a month.
  • Annuals to grow from seed for a big splash of colour include marigolds, alyssum, cosmos, cornflowers, and lobelia as well as scatter packs which are ready-made mixes of summer annuals for sun or shade.
  • Perennials that grow easily from seed include hollyhocks, Shasta daisies, asters, scabious, statice, sweet William, aquilegia, Arctotis, and foxgloves.
  • Cut back or tidy up summer perennials to encourage new growth. Start watering more regularly and fertilise with 5:1:5, 3:1:5 or 8:1:5.
  • Feed irises with superphosphate. Cannas, day lilies, coreopsis and dahlias can still be divided and replanted into well-composted soil.
  • Clivia shows take place in September and they are worth a visit if you want to add to your collection of clivia.

  • Amaryllis, daylilies, and Louisiana irises can be planted from early September but wait until the middle of September to plant Crocosmia and dahlias.
  • Keep watering spring-flowering bulbs and Liliums.
  • Fertilise flowering shrubs with 5:1:5 or 3:1:5 and foliage shrubs with 3:2:1. Trim winter flowering shrubs such as poinsettia.
  • If not done last month, scarify, aerate, fertilise and water the lawn. Water once a week or every two weeks and mow weekly when necessary.

 

 

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