Watering tips
Plants and trees need MUCH LESS WATER than grass. Not sure what the difference is between sprinklers and drip irrigation? You aren't alone.
When it comes to landscapes, watering isn't "one size fits all." How long and often you water your landscape depends largely on the type of plants, shrubs and irrigation components you have. It also varies by time of year.
Whether you have sprinklers or drip irrigation — or both — it's important to know the difference between them, how they work, and when to use them.
💧 Drip watering
Drip irrigation is truly beneficial to plants in desert environments. Drip irrigation systems deliver water more slowly and efficiently, and they should run longer but less frequently than sprinkler systems.
The length of each watering should be determined by the emitter flow rate, soil type, and weather conditions.
It's easy to accidentally over-water your plants on drip systems! Use the information on this page to determine the correct run times for your landscape. Looking for tips on designing and maintaining your drip system? Visit SNWA.com for more information and to sign up for a free drip irrigation class.
How often to water
Seasonal watering restrictions apply to customers with drip irrigation systems. While drip irrigation may occur any day of the week, the number of days is limited by season.
Plants need far less water than grass. Here's how we recommend you run drip irrigation systems during each season:
- Summer: Four days a week
- Spring and Fall: Two days a week
- Winter: One day a week or less
Remember to avoid Sunday watering and comply with seasonal watering restrictions—or face a water waste fine.
How long to water
Determine the amount of time to water based on the rate of flow of your drip emitters.
| Emitter type | Length of each watering |
|---|---|
| High-flow emitter (Up to 20 gph) | 20 - 40 minutes or less |
| Low-flow emitter (Up to 4 gph) | 30 minutes or less |
| Low-flow emitter (Up to 2 gph) | 60 minutes or less |
| Low-flow emitter (Up to 1 gph) | 90 minutes or less |
High-flow or low-flow? Don't know?
- Low-flow: Beads on tip or drips slowly
- High-flow: Streams like a water fountain
- gph: Gallons per hour, often marked on the emitter head. There are many emitter types.
💦 Sprinkler watering
Sprinklers are a perfect match for your grass. That's because they water short and sweet! They work in gallons per minute, and they don't mess around.
How to water grass
For lawns watered by sprinklers, water no more than 12 minutes total. On your assigned watering days, water in three 4-minute cycles, with about an hour between each cycle if using pop-up sprinklers. Water for about 12 minutes each watering cycle if using rotating sprinkler heads.
When to water
Summer: Water overnight or around dawn to minimize the amount of water lost to evaporation. For example. 5, 6, and 7 a.m. And remember to add watering days gradually as temperatures get hotter. Start with three to four days in May, then increase watering days only as needed in June, July and August. Never water on Sunday!
Fall: As early fall days are still quite warm, continue watering overnight or around dawn. For example, four minutes apiece at 5, 6, and 7 a.m.
Winter: Water during the warmer part of the day to prevent freeze and avoid afternoon winds. For example, 8, 9 and 10 a.m.
Spring: 5, 6, and 7 a.m., for four minutes each time. Turn off your sprinklers on those rainy spring days!
Regardless of the season, never water on Sundays!
Sprinkler types
The amount of water needed to maintain your lawn depends on the sprinkler system you have.
Pop-up (most common)
- 3- to 4-inch pop-ups
- Sprays water over large areas
- Run 3 cycles, 4 minutes each
Stream rotor (less common)
- Applies water more slowly.
- Sprays water over smaller areas
- Run 3 cycles, 8 minutes each
Seasonal tips
An important part of a healthy, beautiful landscape is efficient watering for the appropriate season.
- Mandatory fall watering restrictions: From Sept. 1 through Oct. 31, landscape watering is limited to three assigned days per week. Watering restrictions also apply to drip irrigation. Sunday is not an optional watering day. Find your watering group.
- Drip watering: Drip irrigated landscapes need far less water than grass. We recommend watering two days a week in fall. The length of watering depends upon the type of drip emitter. Learn more about drip irrigation.
- 12-minute watering: Water your lawn in three short, four-minute cycles during the early-morning hours. As weather cools, water in several, short mid-morning cycles to prevent ice formation on driveways and walks.
- Save water on rainy days: Turn your irrigation clock off on rainy days or replace it with a smart irrigation clock to do the work for you.
- Check your irrigation system: Inspect filter screens for damage and clean them by opening the end of the filter and running water through briefly. Then, soak the screens in a 50/50 water and vinegar solution if there is mineral buildup. To flush the irrigation lines, find the end cap and briefly run the system to flush out debris. Check valve boxes for debris buildup or muddy conditions indicating poor drainage.
- Fertilizing: Fertilize in late September or early October with a balanced mix of nitrogen, phosphorous and potassium. Fertilizer not only improves turf quality, root growth and color—it also builds cold resistance into your grass.
- Aerating: Compacted soils are common in the Las Vegas Valley. Aerate grass in September or October to boost water penetration, reducing runoff on slopes and helping water and fertilizer nutrients get down to the roots.
- Mulch: Mulch is the little-noticed workhorse of many a smart gardener's landscape. Mulch is a protective covering—organic or inorganic—we place in a wide circle around plants to prevent moisture evaporation, root freezing and weed growth. Using mulch can reduce evaporation by as much as 30 percent.