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Thursday, Aug. 7th 2014

August Gardening Calendar Week 1


  • Continue spraying roses that are susceptible to black spot and other fungus diseases.
  • Annuals may appear leggy and worn now. These can be cut back hard and fertilized to produce a new flush of bloom.
  • Deadhead annuals and perennials as needed.
  • Divide oriental poppies now.
  • Feed mums, asters and other fall-blooming perennials for the last time
  • Roses should receive no further nitrogen fertilizer after August 15th.
  • Powdery mildew on lilacs is unsightly, but causes no harm and rarely warrants control, though common rose fungicides will prove effective.
  • Madonna lilies, bleeding heart (Dicentra) and bloodroot (Sanguinaria) can be divided and replanted.
  • Divide bearded iris now. Discard old center sections and borer damaged parts. Replant so tops of rhizomes are just above ground level.
  • Prune to shape hedges for the last time this season.


  • Zoysia lawns can receive their final fertilizer application now.
  • Apply insecticides now for grub control on lawns being damaged by their activity.


  • Compost or till under residues from harvested crops.
  • Sow seeds of beans, beets, spinach and turnips now for the fall garden. Spinach may germinate better if seeds are refrigerated for one week before planting.
  • Cure onions in a warm, dry place for 2 weeks before storing.
  • Broccoli, cabbage and cauliflower transplants should be set out now for the fall garden.


  • Prop up branches of fruit trees that are threatening to break under the weight of a heavy crop.
  • Protect ripening fruits from birds by covering plants with a netting.
  • Continue to spray ripening fruits to prevent brown rot fungus.
  • Thornless blackberries are ripening now.


  • Soak shrubs periodically during dry spells with enough water to moisten the soil to a depth of 8-10 inches.
  • Once bagworms reach full size, insecticides are ineffective. Pruning off and burning large bags provides better control.
  • Spray black locust trees now to protect against damage by the locust borer.


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University of Missouri Extension Master Gardener Program