Landscape Watering Reminder - September

Historic weather data shows September with nothing much over 102-degrees, so we're starting the month way above normal. Let's hope things cool down this weekend as forecasted. If so, it should be OK to move to the schedule below.

Monsoon storms can be very localized and a comparison of rainfall amounts across the valley bears that out. The UofA Arizona Meteorological Network shows that in the month of August only 1.3 inches of rain fell in west Mesa vs. 2.72 inches in north Phoenix (Desert Ridge). Visit the site and check out your closest weather station results (click on Standard Reports, 2013 "Monthly").


Recommendations are for plants that are established in the landscape (in the ground about 2 years).

Note: These recommendations are a general guideline only and may need to be modified for your specific site conditions.

overseeding is for the birds

Overseeding with winter ryegrass is for the birds.

They LOVE winter rye seed!

See more about overseeding below.

Lawn watering:
Summer grass (Bermuda) - once every 4-5 days
Overseeded cool season grass (rye)-4x per day for 1st 7-10 days to germinate (October is a better time to seed)
If trees and shrubs are on the same valve:
Desert Adapted - once every 18 days
High Water Use - once every 9 days
Tree watering:
Desert Adapted -once every 21 days
High Water Use - once every 10 days
Shrub watering:
Desert Adapted - once every 16 days
High Water Use - once every 7 days
Groundcover and vine watering:
Desert Adapted - once every 16 days
High Water Use - once every 5-6 days
Cacti and succulent watering - once every 28 days
Annual & vegetable watering - once every 3-4 days
Reduce your landscape watering 30 to 50 percent by adjusting your irrigation each season. Landscape Watering by the Numbers: A Guide for the Arizona Desert will help you determine how much water to apply and how long to run your system. Visit the interactive Web version or request a free copy of the booklet at
Bonus tips

  • OVERSEEDING WITH WINTER RYE: September is when activities BEGIN for seeding winter grass (we suggest not doing so until October). And, once again, we encourage all water customers to consider limiting, or forgoing, this practice. Check out our Top 10 Reasons Not to Plant a Winter Lawn.

  • SMARTSCAPE certified landscape professionals have over 20 hours of specialized landscape training in the areas of irrigation, plant material, planting, design and pest management. The program is taught by the U of A Cooperative Extension and sponsored by Valley cities including Mesa. If you're looking for a landscaper, a directory of Smartscape Trained professionals is now available.

  • TOP LANDSCAPE NEWS AND MORE: Why is it important to end bad pruning? What are some great reasons to convert from grass to Xeriscape? Check out our August news at Water - Use It Wisely. Scroll to the bottom of the web page to subscribe for these monthly topics.

  • FREE LANDSCAPE CD: Start planning for fall landscaping! Email us your address and we'll mail you the Water-Wise Landscaping in the Arizona Desert CD. It includes a tip-filled landscape guide, sample landscape plans and a garden gallery with hundreds of design ideas. SRP also hosts an online version.

  • MESA URBAN GARDEN: Heck yea, it's time to garden! If you don't want all the muss, fuss, weeding, digging and amending, why not just rent a garden bed from Mesa Urban Garden? Beds are ready for planting! Soil, irrigation system and water are all included. Visit the MUG website for rental information.

  • How long should you run your irrigation? Each time you water, be sure to water deeply (1 foot for groundcovers, 2 feet for shrubs and 3 feet for trees). How long is that? See our landscape watering guide for a quick and easy way to determine your run times. For example, a 10-foot diameter tree would need about 59 gallons each time you water. If you have three 2-gallon per hour emitters on that tree, your run time would be 10 hours! Yikes! That's OK if your clock allows, but you can drop your run time by adding emitters or replacing your three 2 gallon per hour with 4 gallon per hour (3x4=12 gallons per hour, 59/12 = a 5 hour run time).


    To register for monthly watering reminder emails, visit and click on Email Alerts located in the right navigation bar. Choose Landscape Watering Reminder, and follow the registration instructions. You can remove your name from the list at any time.

    For more information about Mesa's water conservation programs, visit