Local News

Cary studies how to get greener lawns with less water

Posted May 12, 2009
Updated May 14, 2009

— For the Polizzi family, watering their lawn is a closely-monitored science. The family is one of 24 Cary households who volunteered and were chosen for a study that looks at conserving water.

Cary has teamed with North Carolina State University to test new irrigation control devices on residential lawns. The test will last 18 months.

“We always struggle with how to set the sprinkler. Is it too much or too little? And there (were) some new technologies, and we wanted to give it a try,” said Mark Polizzi.

Garry Grabow, an assistant professor at N.C. State, dug up the family’s yard and installed a soil moisture sensor four inches deep in the ground.

“(The sensors) are kind of new to the southeast, especially to North Carolina,” Grabow said.

The sensors transmit to a monitor that attaches to the sprinkler control system, which will prohibit or turn off irrigation if it’s too wet.

“It’s sort of like having a rain switch in your soil,” Grabow said.

Six of the study’s participants will get the moisture sensor. Six others will use a sensor device that attaches to their houses. Six others will receive education on irrigation management. The final six participants will be the control group and do what they always do.

“We’re very interested in how these technologies are going to be effective here in our soils, out weather conditions (and) in our residential settings,” said Marie Cefalo, Cary’s water conservation coordinator. “The results will help guide the direction of our water conservation program.”

If one of the devices delivers a greener lawn with less irrigation, the Town of Cary could encourage homeowners to use them, with incentives, or require their use. The town could also invest more in outreach efforts, if the education group shows better results.

“If there’s a way we can be more efficient, then it’s worth it,” said Kelly Polizzi.

Cary officials said they spent about $3,000 for the equipment to do the tests. Homeowners with the devices will be able to keep them after the 18-month study.


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  • bluecharger May 15, 2009

    will Cary please get a REAL problem?

  • DontLikeTheSocialistObama May 12, 2009

    It's simple.

    Ban the planting of Fescue and other winter grasses in Wake County.

    Then only allow the planting of Bermuda Grass, Centipede, Zoysia, and other warm weather grass in Wake County.

    This will significantly lower the amount of water wasted watering yards.

  • jkbird May 12, 2009

    They also slid in a quick 'We will require it" statement. If the study group gets it free, I do also. Otherwise keep far away from my property.

  • AX May 12, 2009

    Why is the town GIVING away these devices afterwards? With this economy the town could do more with $3000 and the amount of money this study is costing!! Lets use this money to patch up some of the pot holes in this town. Also there are ALOT of street lights out on Caryparkway!

  • chickenlittle May 12, 2009

    There are cheaper ways. Plant clover or drought tolerant grass. Prevent HOAs from fining people if their lawn is not entirely green.

  • planter May 12, 2009

    I'd sign this one up for a budget cut. We'll cut teacher salaries and pay for idiotic things like this. Plant grass that goes dormant when it's dry...so what if it's brown. When it rains it will turn green again. I think there are several better uses for water than watering your grass. And we wonder why the state is broke and everyone wants to raise taxes.

  • Fun May 12, 2009

    A study like this or any sense of plan would never work in "Meekerville" In "Meekerville" it's not about conservation, its about the money! Money to pay non water bills, civic centers and bankrupt restaurants! A Raleigh lifer and Im moving to Cary, where government seems sensible and works for the people.