Close Ad >>

August Lawn & Garden To-Do List

By: Julie Day

August begins right in the middle of the “dog days of summer,” the hottest and most sultry time of the year. Ancient cultures believed that the excessive heat was caused by the alignment of Sirius, the Dog Star, with the sun during the summer. These are the days when everything seems languid and still – except mosquitoes, of course – and the sun threatens to bake lawns, gardens, and gardeners alike.

There is plenty to do in the garden in August, although it is best done in the early morning or late evening when temperatures are more comfortable. Whether you’re in cooler climates making early preparations for autumn, or warmer ones enjoying the height of the garden's bounty, here are some suggestions for tasks around your yard and garden in August.

Lawn Maintenance and Preparation

  • Prepare for fall grass seed planting by leveling low spots, removing weeds, and choosing your seed if it needs to be ordered in advance.
  • Aerate your lawn and dethatch it.
  • If there is plenty of rainfall, fertilize your lawn.
  • To help your grass beat the heat and reduce lawn maintenance, keep your lawn mower blade on the highest setting. Don't worry if parts of your yard turn brown this time of year – it happens.

Annuals and Perennials

  • Spring and summer-flowering perennials can be divided and transplanted after blooming. In zones 5 and warmer: divide overgrown plants and discard the extra, or transplant during the coolest part of the day and preferably in the shade.
  • Trim and fertilize your containers – they still have time for another show.
  • Deal with late-season pests – such as aphids, whiteflies, and spider mites – with a spray of water from the hose.
  • Treat diseased plants, and remove diseased foliage before leaves drop.
  • Prune back vigorous climbers such as wisteria, and train them around trellises while the growth is soft.
  • Propagate plants by collecting seeds, taking cuttings, or layering.
  • Continue deadheading! For prolific bloomers like coreopsis and catmint, shear them lightly to encourage more blooms.
  • Label your plants with garden stakes, particularly perennials that die down to the ground in the fall.
  • In colder zones 1-3, begin moving your houseplants indoors to acclimate them.

Vegetables and Herbs

  • Cut herbs to dry or freeze for winter use.
  • Fall vegetable and herb seeds or starters can be planted now. If you live in colder climates, use a cold frame, otherwise sow directly in the ground. Consider spinach, radishes, carrots, beets, lettuce, overwintering onions, kale, kohlrabi, rutabagas, turnips, dill, cilantro, parsley, and chives.
  • Enjoy your harvest!

Shrubs and Trees

  • Pick up and destroy fallen fruit from fruit trees to limit insect infestations.
  • Make sure newly planted shrubs and trees get plenty of water.
  • Install stakes for training and shaping.

Flowers blooming

Plan Ahead

  • Place orders for spring bulbs. If you live in a warm climate, put them in the refrigerator to chill.
  • Place orders for shrubs and trees to plant in the fall.
  • Apply compost starter to new compost to speed up decomposition for fall use.
  • Take pictures, or make notes, of plants you like while they're blooming and full of leaves.
  • Take note of the growth habits of shrubs for future pruning – they should be at their fullest about now.


  • Water, water, water! Early morning is the best time to water – target plants directly, and water deeply. Avoid getting leaves wet in the hot sun, and avoid soaking containers during the hottest part of the day – both of these can burn plants.
  • Keep close watch on your birdbath, water features, and hummingbird feeder – take steps to correct or avoid mold, stagnation, and mosquito larvae.
  • Continue weeding, to reduce competition for water and nutrients.
  • Beware of powdery mildew, which is caused by moisture and humidity. Help prevent mildew by watering in the cool of the morning, when roots can absorb water but excess will evaporate as the day warms. Also avoid overhead sprinkling in mildew-prone areas. Do not compost leaves that are mildewed.
  • When the temperature is over 85 degrees, avoid chemical applications such as fertilizer, fungicide, or insecticide.
  • Add compost and mulch to keep your garden cool and to prepare for fall planting.

Stay cool, and enjoy the bounty of your work this growing season!

Printable To-Do List

Further Information



Please Leave a Comment

8 Comments on “August Lawn & Garden To-Do List”

You can follow comments to this article by subscribing to the RSS news feed with your favorite feed reader.

  • Delores Fleming Says:
    August 6th, 2016 at 6:49 am

    My problem is that I have these holly sapling growing within my lawn from the roots of my neighbor former holly. I pull up roots that they are growing from but more keep growing. Yes I have hedges of a different style that are space and I would like to put root killer to kill the holly but is afraid that it might spread to my hedges. How can I get rid of this holly that is spreading into my lawn and garden area without destroying my future planting space. Need Help.

  • William Jones Says:
    August 30th, 2014 at 7:02 pm

    I have good solid wood windows, want to put storm windows on the outside of them. I need to reglaze and paint them before installing. Do you think this is a good idea or should I replace the windows instead? I am almost sure the storm windows will have to be ordered, in 1957 when they were installed they were standard windows for the time and area. If I have measured right they will be 36″ X 56″ on the outside. Thank you for any advice given!

  • Official Comment:

    Ben Erickson Says:
    August 25th, 2013 at 12:55 pm

    Hi Virginia,
    Glad to hear you enjoyed our website, come back often!

  • Virginia Carrasco Says:
    August 23rd, 2013 at 9:31 pm

    First time i visit your web site enjoyed it so much new to gardening. Was very informative.

  • Rita Pulaski Says:
    August 25th, 2012 at 6:18 am

    I have a large yard with a good deal of perennials. My problem is most of my plants this year and some of last year are dying from the ground up. The flowers on the top survive on my mums, but my phlox look awful and I keep getting the powdery substance on them. The phlox are near my deck, but the other ones are near my fence. Usually my yard looks great, this year has been a struggle. I even had trouble with my hangers. I found green and red worms eating them and I used sevin to try to rid them, but it did not work.
    Any ideas for Massachusettss bugs?

  • Mary Parker Says:
    August 4th, 2009 at 11:32 am

    I’m in Texas and usualy that is not a bad deal but this year we have had no Rain. Everything is dead. Even the weeds are dying. The thought of a flower garden is wonderful but the Pain of keeping it alive is a very hard thing to imagine. Have you got some Ideas for the poor Texans. Sincerely, Mary Parker

  • WMS Says:
    August 12th, 2008 at 1:29 pm

    I love the photo of the peppers. Great article.

  • jeff-naturehills Says:
    August 1st, 2008 at 4:16 pm

    Your tips are a home run, not a pun because it is baseball season. August can be a long hot month and it is difficult to work in the heat or plan for next spring. But you can’t slack if you are a garden nut like me.

We want to hear from you! In addition to posting comments on articles and videos, you can also send your comments and questions to us on our contact page or at (800) 946-4420. While we can't answer them all, we may use your question on our Today's Homeowner radio or TV show, or online at

August Lawn & Garden To-Do List