Gardening Tips and To-Do Lists for September

A Regional Gardening Almanac

Wheelbarrow and gardening supplies.
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September should bring relief to gardens in the Northern Hemisphere and signal the start of a new season for gardeners in areas that have been too warm for anything but hothouse tropicals, as well as southern hemisphere gardeners. So whether you are beginning the process of putting your garden to bed or gearing up for a fresh start, September can be one of the busiest months in the garden. Let's just hope the weather cooperates.

Garden Tasks for Everyone


  • Stop pruning and fertilizing
  • Bring summer vacationing houseplants back indoors while the windows are still open. Check carefully for hitchhiking pests
  • Start fall clean-up in the flower beds, cutting back anything that has finished blooming or is diseased
  • Take cuttings to overwinter indoors
  • Start winterizing your water garden
  • Watch for frost warning and cover tender plants
  • Photograph your gardens and containers for a record of the year's triumphs and frustrations
  • Give the compost a last turn

Flowers and Other Ornamental Plants


  • Harvest remaining vegetables, including green tomatoes. (Tips for ripening green tomatoes.)
  • Wait for a hard freeze before harvesting Brussels Sprouts
  • Pick herbs for drying or freezing
  • Cure winter squash for storage. Place in a cool, sheltered shady spot for about 1 month.


  • Clean up fallen fruit

Trees & Shrubs

  • Plant trees and shrubs. Keep well watered, if there isn't sufficient rain.


  • Dispose of any diseased or infested plant debris, to avoid overwintering the problem

Garden Tasks for Warmer Areas

Gardening To-Do Lists through the Year:

Jan | Feb | Mar | Apr| May | Jun | Jul | Aug | Sept | Oct | Nov | Dec