August Garden Calendar

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Landscape Plants & Trees in Flower:

  • Crapemyrtle
  • Rose-of-Sharon
  • Hydrangeas
  • Canna*
  • Dahlia
  • Trumpet Creeper*
  • Liriope
  • Black eyed Susan
  • Cosmos
  • Zinnias
  • Lantana
  • Hyssop/agastache*
  • Tickseed/coreopsis
  • Joe-pye weed

*Cari’s Favorites

  • Blanket flower
  • Passion flower
  • Phlox
  • Sedums
  • Asters
  • Beauty berry*
  • Purple coneflower
  • Rattlesnake master*
  • Passion flower
  • Mountain mint*
  • Daylilies
  • Mountain laurel
  • Goldenrod
  • Galax*

image of canna lily

Canna lily

image of mountain mint

Mountain mint

image of galax


image of beautyberry


image of hyssop


image of rattlesnake master

Rattlesnake master

image of trumpet creeper

Trumpet Creeper


  • Strawberries will benefit from a feeding of nitrogen fertilizer this month.
  • Do NOT fertilize shrubs in August, September, October, or November.


  • Plant pansy seed this month in flats for planting in the landscape inimage for Green Thumb Gazette September.
  • Plant fall bulbs like: Spider lily (lycoris), colchicum (autumn crocus), and sternbergia.
  • Sow seed of the following perennials: hollyhock, delphinium, and stokesia to produce healthy plants for next spring.
  • Continue repotting house plants. This will give the plants time to acclimate to their new space before cooler weather arrives.
  • Plant fall vegetables like: beets, Chinese cabbage, cucumber, kale, kohlrabi, lettuce, mustard, radish, rutabaga, spinach, squash, and turnip.
  • Order seeds for your fall vegetable garden.
  • Start making plans for landscape additions Fall is the best time to plant trees and shrubs in the landscape. August is a good time to analyze your site and make decisions on what to plant this coming fall.
  • Divide and transplant your iris and daylilies (late this month through September).


  • Don’t prune or fertilize landscape shrubs for the remainder of the year to allow them to prepare for dormancy. Properly acclimated plants have a greater degree of winter hardiness.
  • Prune bleeder trees as needed. Maple, Birch, Dogwood, Elm, etc.
  • Roses – prune leggy plants ONLY.
  • Brambles – (Blackberry and Raspberry) Prune out the wood that bore fruit. Cut canes to ground level.
  • Blueberries – prune to desired height.


  • Spray the following fall vegetables for insects: broccoli, cabbage, and cauliflower (worms), squash (borers).
  • Continue weekly sprays on bunch grapes and tree fruits.
  • Control the following woody weeds by spraying them with the recommended herbicide: greenbriar, kudzu, trumpet creeper, and wisteria.

Lawn Care:

  • Treat (if needed) lawn areas for grubs. Use the recommended insecticides.
  • In late August, prepare the lawn areas for seeding if you plan to have a tall fescue or bluegrass lawn.
  • Late summer is the most effective time to control fire ants with baits.
  • August is the last month to fertilize bermudagrass, St. Augustinegrass, and zoysiagrass. It is recommended to apply 1 pound of Nitrogen per 1,000 square ft.
  • Mow fescue turf at 3-4 inches for best quality & to avoid scalping/scorching
  • Remember to change direction when moving your lawn. Travel north to south on one mowing and east to west on the next cutting
  • Take soil samples for testing and to prepare for fertilizer applications in the fall. Soil boxes are available at the N.C. Cooperative Extension, Alexander County Center (Free until December 1!)Funny image for rabbit mower

Specific Chores: 

  • Rake around fruit trees to remove fallen leaves and dropped fruit. This will help break up the life cycles of destructive insects and disease-producing organisms that might overwinter in the leftover plant material.
  • Continue harvesting mature cucumbers, squash, green beans, indeterminate tomatoes, and okra plants at least once or twice a week to maximize production.