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September Garden Calendar – NC Mountains

September Garden Calendar

Plants in Flower

  • Crapemyrtle, Rose-of-Sharon, Dahlia, Canna, Ginger Lily, Chrysanthemum, Spider Lily, Fall Crocus, Liriope, Sedum, Asters, Goldenrod, Joe Pye Weed, and summer annuals

What to Fertilize

  • NONE – See what’s happening in Lawn Care.

What to Plant

  • September is a good time to set out landscape plants. Shop early to find the nicest shrubs.
  • When planting containerized plants, try to be certain to disturb or “open up” the plants’ root ball.
  • Set out new chrysanthemum plants this month.
  • Plant pansies to add color to your yard in the autumn, winter and spring months.
  • Groundcovers will become well established if planted now.
  • Transplant any evergreen trees or shrubs that need moving this month.
  • Plant the following fall vegetables in September: mustard, onion, radish and turnip.
  • If you do not have a fall vegetable garden plant legume cover crops like crimson clover or hairy vetch. Wait until October for small grains.

What to Prune

  • Do NOT prune shrubs in September or October..
  • Remove “weed” or unnecessary trees from your landscape.
  • Rootprune any trees or plants you plan to move next spring.

Pest Outlook

  • Spray the following landscape shrubs for the following insect pests: arborvitae, hemlock and juniper(spider mites), azalea and pyracantha (lace bug) and euonymus (scale).
  • Spray for peach tree borer on your nectarine and peach tree trunks.
  • Continue with rose spray program.
  • Keep a close eye on all fall vegetable plants. Insects and diseases are more severe in the autumn.
  • Control the following woody weeds by spraying the recommended herbicide: trumpet creeper, and blackberry.

Lawn Care

  • Tall fescue and bluegrass lawns should be seeded this month. Remember to mulch the newly seeded areas with wheat or barley straw. Keep watered.
  • Fertilize and lime your tall fescue lawns according to soil test results.
  • Do NOT fertilize zoysia now.
  • Homeowners can apply an insecticide for lawn grubs in early September if not completed in August.

Propagation

  • Spring flowering bulbs can be divided and replanted this month. Daffodils will be the bulbs that most likely need this consideration.

Specific Chores

  • Clean up garden sprayers and lawn equipment if not in use.
  • Prepare house plants to reenter your home. Check them carefully for insect pests.
  • If you do not have a fall vegetable garden, it is a good time to chop, till, burn or discard dead vegetable plants.
  • Look for spring flowering bulbs to plant in October.
  • Purchase locally grown apples.
  • You can get last year’s poinsettia to flower by placing it in total uninterrupted darkness for 15 hours a day, starting the last week of the month and continuing until colored bracts appear. Give them plenty of sunlight during the day.

All Year’s Garden Calendar