What to do in your Arizona garden in August:

  • Prepare your Arizona garden in August for fall planting by removing spent summer-heat loving vegetables and adding fresh compost to the soil.  
  • August is a great time for a monsoon planting of several summer vegetables to take advantage of the rain and higher humidity of the monsoon season. Monsoon planting can yield harvests in October.
  • Arizona gardeners in August should prepare the soil and your garden for fall planting. See my “Step-by-Step Guide to Starting a Garden” to get started.
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Arizona garden beds in August

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Cut peppers back to new growth to encourage new flush of growth and fall crop. Remove debris around plants to discourage pests. 

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Sweet potatoes that were started back in May are really taking off. I fertilize them once over the summer (in July or August) and give them regular water. I will harvest these in late October or November. 

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Malabar spinach is producing well and will continue up until we get a frost. Consider leaving a spot for it in your fall garden if you have room. 

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It’s a great time to plant beans in your Arizona garden in August and get a fall harvest of your favorite types. 

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Arizona flowers in August

Keep flowers deadheaded to encourage more blooms. Plant zinnias, cosmos, marigolds and sunflowers with during monsoon season. Plan your wildflower garden for fall. 

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Gaillardia is a perennial wildflower that can grow nearly year round in Arizona.
Very easy to grow from seed. Remove spent blooms and harvest seeds to spread around yard if desired.

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Zinnias are a heat loving flower best grown from seed. There are so many varieties to choose from. Cut faded blooms to encourage more flowers. You can continue to plant zinnias in your Arizona garden in August. 

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Arizona fruit trees in August

Keep fruit picked on fruit trees. Clean up rotten or fallen fruit to help prevent leaf-footed bugs. Don’t prune this month. Fertilize citrus this month or the beginning of September.

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Lemons begin to ripen. Harvest the lemons as needed. They will continue to ripen over the next several months. Flavor is best right after picking. Lemons can be stored in the fridge for a couple of weeks, but it’s best to leave lemons on the tree until needed.

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Watch pomegranate trees for leaf-footed bugs. Remove by hand and discard severely damaged fruit. Clean up dropped fruit. 

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Arizona herbs in August

Herbs may look a little spent. Continue to harvest as needed but wait until September to give them a good trim and decide if you want to replant.

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Harvest and use basil. Cutting back basil often encourages new growth and keeps it from flowering and going to seed. 

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Fennel is flowering and going to seed. The bees and other pollinators love it. 

Arizona Garden in August To-Do List:

  • Get garden beds ready for planting by adding compost and a balanced organic fertilizer.
  • Refresh containers with additional potting soil. Organic matter decomposes and needs to be replenished.
  • Harvest spent artichoke heads to save the seeds.
  • Harvest I’itoi onions.
  • Harvest sunflower seeds.
  • Deadhead annual flowers (cut off spent blooms).
  • Apply last round of fertilizer to citrus between August and September. Water well the day before you fertilize and again after fertilizing. August is the time for the third application of citrus fertilizer. Fertilize citrus on or around Valentine’s Day, Memorial Day, Labor Day each year.
  • Evaluate plants around yard. If they are overly stressed, check watering and shade/sun conditions. Consider moving or replanting in another spot to improve conditions.
  • Contain the urge to plant landscape plants if possible; planting in September is a much better time to plant landscape plants.
  • Continue to mulch plants.
  • Cut back perennials by ⅓ to clean up and encourage new growth.
  • Water plants twice as deep as normal once this month to leech salts from soil around plants roots.
  • Plan your wildflower garden for fall.
  • Spray off plants with water about once a week to control spider mites

What to plant in Arizona in August :

  • Transplants of Peppers and Tomatoes can be planted at the beginning of the month. Provide shade for newly planted tomatoes if possible. 
  • The following can all be started from seed this month in Arizona: Beans, Bok Choy, Broccoli, Brussell Sprouts, Cabbage, Carrots, Cauliflower, Celery, Chard, Collard Greens, Corn, Cucumbers, Endive, Kale, Kohlrabi, Lettuce, Mustard, Green Onions, Summer Squash and Turnips. 
 
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