Summer Watering in the Arizona Desert

Summer Watering in the Arizona Desert

By Bo Barrett on August, 22 2019
Landscape Tips

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Watering in The Desert Can Be Tricky 

It is essential to know when to water, how often, and even more important, how deep to water. These factors are crucial for the success of any landscape type. Here we will discuss these topics and help ensure adequate irrigation throughout the hottest months in the Phoenix area.

The best time of the day to water your trees and plants is in the early morning. The ideal time to turn your drip system on and give your plants a good drink for the day is between 4:00 am and 6:00 am. As temperatures rise in the summertime, the trees and plants in your yard will need to maintain adequate moisture to ensure proper growth and root establishment. It also helps to prevent any wilting, burning, or stress associated with higher summertime temperatures. 

Stay away from watering during mid-day, evening, or nighttime. Midday irrigations are often too late and can cause thirsty trees to stress more. Watering in the evening time, especially during moist or humid nights, will promote mold and fungal growth that can affect your plant or your tree's overall health.

Now that we know the right time of day to water, it’s necessary to understand how deep, and how often, to water. Most new trees or plants will benefit from being watered every day for the first week.


Watering plants and lawnWatering Depths

For ground covers or smaller shrubs, ensure that your water is getting into the soil at least 12 inches deep.

For medium-to-large shrubs, your water should reach 12 to 18 inches deep.

For trees, the water should reach 2 to 3 feet deep.

To check the depth of the water and make sure it drenches the soil, you can use a piece of rebar, a dowel rod, or one of the two-foot planting flags that we have here at the nursery. You will want to probe the soil and several different areas around the initial planting area and ensure that the water is getting to the depths recommended.

If you are probing the soil and the rods only going down one foot into the ground, probe other areas, and if you’re still reaching a depth of one foot, then you know you are not watering long enough. You can now adjust your system to run longer and then probe again to ensure the proper depth.


Chinese pistache tree - Chinese Pistachio tree in landscape Watering Schedule

Tropical varieties should be watered in the summertime when temperatures are above 100° 4 to 5 times a week.

Subtropical varieties should be watered 3 to 4 times a week.

Desert varieties can be watered about two times a week or every third or fourth day.

Making sure that the water is getting down 2 to 3 feet on your trees and saturating the entire root ball is important and will eliminate how often you need to run your system if you’re watering to the proper depth. You can also check the top of the soil. When the soil is dry an inch or two below the surface, it’s typically time to water again

Lastly, you should water at the drip line (the canopy's edge or tips of the canopy), which is where the feeder roots exist. As the tree or plant establishes, move the drip lines to the edge of the tree's canopy. This will ensure that your roots continue to grow in the right direction.


For more tips or any questions on watering your trees, call your closest location today or visit us at! To learn more incredible yard care advice, design tips, and tree knowledge, check out our library of articles! We have a massive catalog of entertaining and informative articles written by our experienced nursery professionals to help you succeed with all of your landscaping goals. 


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