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8 smart garden ​irrigation systems to save water and lower your bills 2019

These sprinkler controllers use hyperlocal weather forecasts, algorithms, Alexa control and much more

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As any green-fingered friend will tell you, there's much more to gardening than simply drenching the lawn and flowerbeds with a hosepipe each evening.

The climate can affect how much water your plants need, of course, but so too does the type of soil your garden has, and how much sunlight it gets each day. Because the weather often varies from one day to the next, how much water your plants need also changes - and different plants require drastically differing amounts of water.

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An increasingly important consideration here is water waste, which not only costs you money, but can be a waste of local resources and bad for the environment.

Thankfully, you don't need to be a horticultural expert to give your garden exactly the right amount of water each day. A number of smart irrigation can take care of this for you, and many also tap int smart home systems like Amazon Alexa, Google Home, Apple HomeKit, and IFTTT (If This, Then That).

With the summer approaching, here is GearBrain's guide to some of the most popular smart irrigation systems on sale today:

Rachio 3

Photo of the Rachio smart garden irrigation system

The Rachio 3 can water 16 different zones across your garden

Rachio

Just a year old, the third-generation Rachio smart watering system can control water in up to 16 zones across your garden.

Rachio claims this system can pinpoint the weather to within a 36-foot radius of your home. Keeping such a close eye on the local weather means the Rachio will adjust its scheduled watering based on the forecast. That way, your garden won't be flooded, while your plants and lawn get the exact amount of water they need.

For an extra $50, the Rachio 3 can be bought with the company's water flow meter, which attaches to your pipe and alerts you to changes in flow, which could be a sign of a leak.

Available on Amazon

The system can be configured to switch on when a security camera detects movement in a certain area — a useful burglar deterrent — and you can set a sprinkler to activate if a Nest Protect alarm senses smoke. Fitting a Protect sensor in your shed or garage, and a sprinkler by the door, could make for a useful fire containment system.

A neat feature is that the Rachio app warns you just before the sprinklers come on - useful if you're having a garden party and forgot to adjust the schedule.

There's a smartphone app for programming and controlling Rachio, but the system can also be used via Amazon Alexa, Google Home, Samsung SmartThings, IFTTT, Wink and even a Nest thermostat if you have one. GearBrain reviewed the second-generation Rachio ($180) and gave it 9 stars out of 10. We liked Rachio's customer support, who are on-hand to help with installation questions, and how well it integrates with other devices.

Orbit B-hyve

Photo of the Orbit B-hyve smart garden irrigation system

The B-hyve is a strong option for gardeners on a budget

Orbit

Starting at $79 for a system capable of watering six zones (or $99 for 12 zones), the Orbit B-hyve is one of the more affordable smart sprinkler controllers. But that doesn't mean it misses out on features, as it can still be tweaked based on the type of plants, sprinklers and soil in each zone.

The app also lets you input sun exposure, shade, and gradient data for each zone. It then adjusts its watering schedule based on local weather forecasts provided by the National Oceanic and Atmospheric Administration. If rain is due in your area, watering is delayed.

Available at Amazon

GearBrain reviewed the Orbit B-hyve and we were impressed with how the system splits each watering event into two halves with a short gap between; that way, water can soak into the soil and your plants won't drown.

Smartphone notifications let you know when watering has finished, if it has been delayed by rain, and when temperatures fall below freezing.

Netro Smart Sprinkler Controller

Photo of the Netro irrigation system and smartphone app

Installation takes just 15 minutes, Netro says

Netro

This smart sprinkler system by Netro can control six zones across your garden and is compatible with Alexa, so you can control it by speaking to the Amazon assistant.

The amount of water distributed in each zone is adjusted based on the plants you have living there, along with the weather forecast and historical climate statistics. Being connected to the Wi-Fi means you can control the system remotely - while away on vacation, for example - from your smartphone (iOS or Android).

Netro claims the system is simple enough to be installed in just 15 minutes, making this a good option for garden amateurs; no professional tools or skills required. The company also claims using the system could save you up to 50 percent on your water bill.

The Netro Plant Database contains the water requirements of over 1,000 common species of plant, so it's likely that whatever you are growing will be catered for, and the system will know how much to water them each day.

Buy on Amazon

Rain Bird

Photo of the Rain Bird wifi smart garden irrigation system and phone app

Rain Bird has made irrigation systems since the 1930s

Rain Bird

Rain Bird has been in the irrigation industry since the 1930s, so knows a thing or two about keep your garden watered correctly. The company's smart system combines a wall-mounted control center with a smartphone app and an internet connection via Wi-Fi to deliver the correct amount of water to each part of your garden.

The system, which can control up to eight individual zones, adjusts itself based on the weather forecast, but also seasonal changes in local climate and what your plants need throughout the year. You can set up to six start times per day, per zone, water for up to 199 minutes per session (useful if you need to give a new lawn a good soaking), and use an iPhone or Android handset.

Rain Bird Available on Amazon

Spruce

Photo of the Spruce smart garden irrigation system and soil moisture sensor

The Spruce system includes soil moisture sensors for real-time data

Spruce

For larger gardens - or gardens with a greater variation in plants - the Spruce is a good option, as it caters for you to 16 different zones. As well as delivering water based on the local weather forecast, the Spruce system also takes real-time readings from moisture sensors placed in your soil.

Spruce claims the system can lower your water usage by up to 60 percent if left to its own devices, although you can set up manual scheduling if you prefer to have more control over how much water is used. A water flow meter is also a part of the system, alerting you to any drops in pressure which could be the result of a leak in your irrigation system.

Amazon Alexa integration means you can control the Spruce by speaking to your Echo smart speaker. With Alexa you can ask the system to start or stop watering, enable or disable manual scheduling, and for information on recent waterings.

Spruce Available on Amazon

Scotts Gro

Photo of the Scotts Gro 7 smart garden irrigation system

The Gro system by Scotts includes an Amazon Alexa skill for voice control

Scotts

Scotts Miracle-Gro will be a familiar name to anyone who is passionate about gardening, and its 7 Zone Controller was previously sold by Blossom, a startup acquired by Scotts in late-2016.

Giving the older company a leg-up into the smart garden sector, the 7 Zone Controller can control up to seven sprinkler zones across your garden. The controller unit needs to be installed indoors (so inside your garage or shed, ideally) as it isn't weatherproof, and once set up you can control the system from the Gro smartphone app for iOS and Android.

As with others, the Scotts Gro programmes itself based on local weather forecasts and it can be controlled by speaking to Amazon Alexa and Google Assistant.

Available on Amazon

RainMachine

Photo of the RainMachine's touchscreen display

The Rain Machine features a 6.5-inch touchscreen display

Green Electronics

While smartphone and Alexa control of your sprinkler is all well and good, sometimes it's convenient to just look at the control panel itself. That's where the RainMachine comes in, with its 6.5-inch HD touchscreen for controlling every aspect of your watering system.

Because the RainMachine's internet connection is only used to check local weather forecasts (and adjust watering accordingly), every other aspect of its operation can be controlled and adjusted when your internet is down, unlike other services which require a permanent connection to the cloud.

As well as the control panel, the RainMachine has its own iOS and Android apps, and it can be bought with compatibility for 12 or 16 sprinkler zones.

Available on Amazon

Skydrop

Photo of the Skydrop smart garden irrigation system with Amazon and Google smart speakers

The Skydrop works with a wide range of smart speaker and displays from Amazon and Google

Skydrop

Finally, the Skydrop is an eight-zone smart irrigation system which checks hyperlocal weather forecasts hourly and has an integrated LCD display for direct control. There is also a companion app for iOS and Android, voice controls from Alexa and Google Assistant, integration with Nest thermostats, and the potential for connecting to many other devices via IFTTT (If This, Then That).

During setup, you can tell the app about the soil and plant types in each zone, plus the gradient of your land, how much sun and shade each zone gets, and what type of sprinklers you have. The Skydrop then automatically delivers the correct amount of water each day.

Available on Amazon

For controlling nine to 16 zones, a $50 expansion kit can be bought, and the controller unit can be placed outside if you purchase Skydrop's weatherproof housing, also costing $50.

And don't forget to visit The GearBrain see what other connected devices work with Google Home or Amazon Alexa enabled device.


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The GearBrain

See which products "work with" either Google Assistant or Amazon Alexa by clicking on the device below.