September To Do

SEPTEMBER Gardening To-Do List

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Zone 3

  • Divide peonies and other spring and summer-blooming perennials
  • Plant perennials
  • Plant bare-root and containerized trees and shrubs
  • Sow wildflower seed for spring bloom
  • Plant spring-blooming bulbs
  • Dethatch and aerate lawns
  • If September rainfall is scarce, water trees and shrubs to keep them supple and prevent winter damage
  • Clean and restock birdfeeders
  • Plant garlic for harvest next summer
  • Set out bareroot peonies
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Zone 4

  • Harvest apples and store in a cool place
  • Plant garlic
  • Dethatch and aerate the lawn
  • Clean out rose beds and apply fungicide one last time to susceptible varieties
  • Plant perennials
  • Move tender houseplants, etc. indoors after rinsing and reporting, and set up a grow light to supplement natural light
  • Clean and restock bird feeders
  • Begin to move tropical water lilies and other tender aquatics indoors
  • Plant spring-blooming bulbs; refrigerate those you intend to force
  • Set out bareroot peonies
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Zone 5

  • Set out transplants of cool-weather vegetables
  • Plant winter-hardy pansies and fall annuals (calendula, dianthus, ornamental cabbage and kale)
  • Plant tag teams of perennials and spring-blooming bulbs that will complement each other or bloom in sequence next season
  • Water trees and shrubs when rainfall is scarce to “winterize” them
  • Dethatch and aerate the lawn
  • Deadhead chrysanthemum plants to keep flower buds forming through the fall
  • Clean out rose beds; apply fungicide; leave hips for winter color and bird food
  • Prune summer-bearing raspberries
  • Mow back strawberry plants; remove weeds and remulch
  • Move tender houseplants, etc. indoors after rinsing and repotting, and set up a grow light to supplement natural light
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