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Your September Landscape Watering Reminder

Post Date:09/05/2018 5:01 PM
sprinklers for overseeding


Yes, it’s still a bit HOT, but with higher humidity and shorter day length, water needs of plants is not as high as it was in mid-summer. Remember that September 30 is the ‘official’ end of the Monsoon Season, so there’s still hope for more summer rains. September is also when activities BEGIN for seeding winter rye grass (we suggest not doing so until October). And, now more than ever, we encourage all water customers to consider limiting, or forgoing, this practice. Find details in Bonus Tips below.

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

Lawn watering

  • Summer grass (Bermuda) - once every 4 or 5 days
  • Overseeded cool season grass (rye) – 4x per day for 1st 7 to 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, Groundcover, and Vine watering

  • Desert Adapted - once every 16 days
  • High Water Use - once every 7 days

Cacti and Succulent watering - once every 25 days

Annuals watering - once every 3-4 days

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

++Bonus tips++

WINTER RYEGRASS: TO OVERSEED OR NOT TO OVERSEED: Let us help with our Top Ten Reasons Not to Plant a winter lawn. These might just be the excuses you were looking for. 

GASP! ARE YOU GOING TO PLANT WINTER GRASS ANYWAY? PLANT WINTER GRASS CORRECTLY. Learn more in this AMWUA blog from turfgrass researchers at the University of Arizona’s Maricopa County Cooperative Extension program. 

TOP LANDSCAPE NEWS AND MORE: Learn about one of our most heat tolerant plants that has the dainty name of slipper flower, choose safer products for your home and family that won’t pollute our water, find out about the geology behind Rogers Lake, and more. Check out our August news at Water - Use It Wisely. Scroll to the bottom of the web page to subscribe for these monthly topics.

WATER - USE IT WISELY Calendar of Events features landscape workshops happening across the Valley.

ONLINE WATER-EFFICIENT LANDSCAPE GUIDE: Start planning for fall landscaping! SRP hosts this online program that includes a landscape gallery, sample landscape plans and hundreds of design ideas.

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. Contact Laurie at 480-202-3022 or See gardening classes listed below, but here's an upcoming event at the garden, located at 212 E 1st Ave.

  • OCT 14: 1st Annual Go with the Flow Tour. 9 a.m. to Noon. Mesa Urban Garden’s rainwater harvesting demonstration will be on this self-guided water harvesting tour so that you can experience backyard rain gardens, rain tanks, greywater systems, green infrastructure, native wildlife habitat, and much more to inspire ideas for your dream yard! Free, but must register!

SEED LIBRARY at Mesa Main Library. The Seed Library allows library card holders to check out three seed packets per month for free. Choose from a wide variety of seeds for edible plants and herbs, bring your seeds home to grow, and save the seeds to donate back to the library.

How long should you run your irrigation? Each time you water, be sure to water deeply. About 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 (click on online watering guide or see pg 9). 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). It’s just a little math!


  • SEPT 13: GROW ORGANIC VEGETABLES YEAR-ROUND. 6-8 p.m. The cool season is one of our best growing times. Master Gardener Emily Heller will guide you through our two major gardening seasons and our shoulder seasons. $20. Register.
  • SEPT 23: FALL VEGGIES. 2-4 p.m. Taught by Master Gardener Pam Perry, she’ll demonstrate the advanced techniques of how to set up your plot, get the best soil and watering systems, and how to cultivate your own vegetables for the season. $20. Register.
  • OCT 27: MESQUITE PANCAKE BREAKFAST. Come on out and enjoy a scrumptious breakfast including pancakes made from mesquite pod flour! You’ll also be supporting Trees Matter, a nonprofit supporting tree planting in the Valley. Details.
  • NOV 3: Are you into birds and gardens? It’s almost here, the annual, bird-friendly, water conserving, East Valley garden tour. Get great ideas from local birding and garden enthusiasts own backyards. More details at 2018 Tour de Bird including locations and maps.

NOTE: Fall plant sales are coming up in October!

**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 website or request a free copy of the booklet at


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