August Gardening Checklist for Austin and Travis County

August Gardening To-Dos

Fall Aster - Aster oblongifolium - August Gardening To-Dos

Fall Aster – Aster oblongifolium

Here in Austin, August is the month where gardeners start to lose the will to go outside and tend their plants. The heat, humidity, and constant battle to keep everything watered can exact a toll on the most chipper of souls. Chin up! This is a great month to win the weed war since most are not continually reappearing. It’s also time to jumpstart fall vegetable gardening. And it you can keep away from mosquitoes, it’s a perfect opportunity to sit in the shade and enjoy the rewards of your hard work. See below for other things that should be on your August gardening to-dos.

Things to Do in the Garden for August


Hold off on fertilizer for lawns and ornamental plants. If you must, use liquid fertilizers and water deeply.


It seems counter intuitive, but fruit and nut trees need extra water this month to start creating fruit buds for the following year. Water trees deeply and slowly.


Add fall bloomers toward the end of the month, and make sure to water as needed.


Replenish mulch. Re-start the compost pile so you’ll have plenty of finished compost next month for fall gardening, or research soil yards for best compost to purchase.


Mow only enough to remove one-third of the leaf blade each time you mow and follow recommended mowing heights. Leave the clippings on the lawn to replenish organic matter. Avoid weed killers – most not recommended with temperatures above 85° F.


Watch for tree borers and spot treat with horticultural oil. Avoid getting the oil on leaves. Watch for grubs, chinch bugs and fire ants. Treat as needed. See the Grow Green FAQ sheets for least toxic solutions. Blast water on the undersides of leaves to remove spider mites and aphids. Fall webworms start to appear this month. Use a pole or blast of water to break open the webbing to allow birds and wasps access to the caterpillars.


Prune roses back by one-third to encourage fall blooms. Deadhead flowers. Remove spent blooms and seed pods from Crape Myrtles for continued bloom. Keep weeding, being careful not to let the plant go to seed. Sow wildflower seed, especially bluebonnets. Stay hydrated when working outside and take advantage of slightly cooler morning and evening temperatures.


Plant your last round of green beans, cucumbers, and squash late in the month, using varieties that produce in 60 days or less. Plant seeds for brassicas, Swiss chard and other fall vegetables indoors under grow lights or outside in a bright shady spot. Seedlings will be transplant size in about 6 weeks. Extend your harvest by planting a few seeds a week or so apart so that plants will mature at different times. For fruiting crops, make sure they have a reliable irrigation schedule so that they will continue to produce through the heat. Remove any spent or diseased plants in preparation for fall planting. Keep peppers and eggplant growing strong with a regular supply of moisture and a dose of water-soluble fertilizer every two weeks; they love fall weather and will produce right up until frost. See the full Vegetable Garden Planting Guide (Español, 繁体中文) and Vegetable Varieties for Central Texas.

Get Growing!

French philosopher Jean-Jacques Rousseau wrote “Plant and your spouse plants with you; weed and you weed alone.” This handy reference will help you chart out your gardening plan to involve your family even in the heat of August and serve as a reference for what things to do in the garden each month: January, February, March, April, May, June, July, August, September, October, November, and December.

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