September Gardening Calendar: Ornamentals

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  • Weeks 1-4: Continue planting evergreens now.
  • Weeks 1-3: Cuttings of annuals can be taken now to provide vigorous plants for overwintering.
  • Weeks 1-3: Herbs such as parsley, rosemary, chives, thyme and marjoram can be dug from the garden and placed in pots now for growing indoors this winter.
  • Weeks 2-4: Except tulips, spring bulbs may be planted as soon as they are available. Tulips should be kept in a cool, dark place and planted in late October.
  • Weeks 2-3: Begin readying houseplants for winter indoors. Prune back rampant growth and protruding roots. Check for pests and treat if necessary. Houseplants should be brought indoors at least one month before the heat is normally turned on.
  • Weeks 3-4: Perennials, especially spring bloomers, can be divided now. Enrich the soil with peat moss or compost before replanting.
  • Weeks 3-4: Divide peonies now. Replant in a sunny site and avoid planting deeply.
  • Weeks 3-4: Lift gladioli when their leaves yellow. Cure in an airy place until dry before husking.
  • Week 3: Poinsettias can be forced into bloom for Christmas if they are moved indoors now to a sunny windowsill. Each night, they must be kept in a cool, dark place where there is no light for 14 hours. This must continue until proper color is achieved in 6-10 weeks.

Gardening Calendar supplied by the staff of the William T. Kemper Center for Home Gardening located at the Missouri Botanical Garden in St. Louis, Missouri.(www.GardeningHelp.org)

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