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September Gardening To Do List

December gardening

Zone 1
  • Sow wildflower seeds
  • Water to winterize trees and shrubs
  • Clean up vegetable and perennial gardens
  • Plant spring-blooming bulbs
  • Apply winterizing formula lawn fertilizer (with high potassium)
  • Clean out greenhouse and sterilize bench tops
  • Sow salad greens and make or buy a cold frame for frost protection
  • Bring in bonsai, scented geraniums, poinsettias and Christmas cactus and set up grow lights if necessary
  • Take cuttings of annuals and herbs for indoor rooting
  • Clean off birdfeeders; clean out and put away birdbaths for the winter

Zone 2

  • Prune tomato roots to hasten ripening
  • Winterize trees and shrubs with deep waterings
  • Dethatch and aerate lawns
  • Sow salad greens and get the coldframe ready
  • Clean up rose bed and apply fungicide one last time to mildew and blackspot prone varieties
  • Harvest apples; put spoiled fruit in compost pile
  • Clean off birdfeeders and restock with seed
  • Deadhead chrysanthemum plants to prolong bloom
  • Plant garlic for harvest next summer
  • Sow wildflower seed for bloom next spring

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

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 repotting, and set up a grow light to supplement natural light
  • Clean and restock birdfeeders
  • 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

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
  • Dehead 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

Zone 6

  • Set out cool-weather vegetable transplants, including salad greens, broccoli, kale and cabbage
  • Plant garlic and leeks
  • Prune cane fruits such as raspberries and blackberries
  • Plant winter 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
  • As tops die back, harvest potatoes, onions and garlic
  • Plant peonies
  • Plant fall-blooming bulbs to brighten up fading window boxes, planters and in drifts among ornamental grasses
  • Continue to harvest herbs, grasses and flowers for drying
  • Divide peonies, bearded iris and other spring- and summer-blooming perennials.

Zone 7

  • Set out transplants of cool-weather vegetables
  • Prune cane fruits such as raspberries and blackberries
  • Plant winter pansies and fall annuals (calendula, dianthus, ornamental cabbage and kale)
  • Plant peonies
  • Plant fall-blooming bulbs to brighten up fading window boxes, planters and in drifts among ornamental grasses
  • Continue to harvest herbs and flowers for drying
  • Divide peonies, bearded iris and other spring- and summer-blooming perennials
  • Plant bareroot trees and shrubs
  • Order sweet pea seedlings for fall planting
  • Plant herbs and groundcovers as the weather cools
Zone 8
  • Plant bareroot trees and shrubs
  • Order sweet pea seedlings for fall planting
  • Set out second crop of tomato and pepper plants
  • Sow seeds of green beans, squash, pumpkins and cucumbers
  • Divide bearded iris and other overcrowded spring- and summer-blooming perennials
  • Prune cane fruits
  • Continue to harvest herbs and flowers for drying
  • Sow seeds of perennials and keep soil moist if rainfall is scarce
  • Start cool-weather vegetables from seed now or set out store-bought transplants later in the month
  • Plant winter pansies and fall annuals (calendula, dianthus, ornamental cabbage and kale

Zone 9

  • Order sweet pea seedlings for fall planting
  • Plant fall- and winter-blooming perennial plants
  • Prune summer-flowering shrubs and vines
  • Plant winter pansies and fall annuals (calendula, dianthus, ornamental cabbage and kale) later in the month
  • Deeply irrigate trees and shrubs every few weeks
  • Plan for spring bulb gardens by seeking out specialty bulbs (species tulips, Dutch iris, anemone, ranunculus) that thrive in rainy winter, dry summer climates
  • Groom and fertilize hanging basket and container plants to keep them thriving through the fall
  • Sow cool-weather vegetable seeds
  • Clean out rose beds and reapply fungicide to disease-prone varieties
  • Sow seeds of perennials and keep soil moist if rainfall is scarce

Zone 10

  • Order roses for fall planting
  • Sow cool-season vegetable seeds
  • Prune summer-flowering shrubs and vines after bloom
  • Sow seeds of perennials and keep soil moist if rainfall is scarce
  • Deeply irrigate trees and shrubs every few weeks
  • Plant fall- and winter-blooming perennials
  • Groom and fertilize hanging basket and container plants to keep them thriving through the fall
  • Set out second round of tomato and pepper plants
  • Sow seeds of green beans, squash, pumpkins and cucumbers
  • Clean out rose beds, prune lightly and reapply fungicide to disease-prone varieties

Zone 11

  • Sow seeds of desert wildflowers
  • Groom and fertilize hanging basket and container plants to keep them thriving through the fall
  • Sow seed of cool-weather vegetables
  • Order roses for fall planting
  • Set out second round of tomato and pepper plants
  • Sow seeds of green beans, squash, pumpkins and cucumbers
  • Deeply irrigate trees and shrubs every few weeks
  • Clean out rose beds, prune lightly and reapply fungicide to disease-prone varieties
  • Continue to harvest summer vegetables to encourage more fruits to form
  • Build a compost pile for fall soil improvement

 

 



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