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September garden planner

What to do in your garden in September

What to do in your garden in September



  • Clean out bird feeders and refill them with nuts and seeds.
  • Apply an autumn lawn feed towards the end of the month.
  • Turn the compost heap before winter.
  • Remove shading from greenhouse.
  • Reseed any bare lawn patches after summer droughts.


  • Cut out stems that have fruited on blackberry bushes, and tie the new canes into support wires.
  • Prune rambling and climbing roses, removing old and unproductive stems and tying in new growth.


  • Sow a green manure on bare ground to dig back into the soil.
  • Order or buy tulip bulbs now for the best selection, keeping them until November before planting.


  • Sow hardy varieties of lettuce such as landcress and winter purslane ready for picking next spring.


  • Ornamental onions make great flowering plants. For swathes of purple-headed drumsticks through the border next summer, plant allium bulbs now, Purple Sensation for high summer, Sphaerocephalon for late summer.
  • Boost the flower show in borders with late-flowering perennials, such as rudbeckia, Aster frikartii Monch, echinacea and Michaelmas daisy Aster novae-angliae, which is resistant to powdery mildew.
  • Repotted, place chrysanthemums in large mounds, make great early autumn displays for the patio.
  • Plant daffodil bulbs for some early spring sunshine, using bulbs of dwarf daffodils such as Tete-a-Tete for front of borders and containers.
  • Plant outdoor hyacinth bulbs in containers, three or five per pot, and plant smaller grape hyacinth, Muscari latifolium, in drifts through the border for ribbons of blue in spring.
  • Plant wallflowers and forget-me-nots.


  • Treat the tricky weed mare's tail with a glyphosate-based weedkiller to weaken it.


  • Pick the first of the apples and pears.
  • Pick all of the tomatoes off plants by the end of the month. Green tomatoes can be left to ripen in a brown paper bag with a banana.
  • Keep cutting cucumbers in the greenhouse.