To maintain the lush, green lawn of your dreams is challenging during a heatwave. When the soil is dry in the summer, any moisture there is can struggle to soak into the ground. That is where a lawn wetting agent makes a huge difference.
Never heard of one? Wetting agents actively help water to penetrate deep down into the lawn, hydrating the roots and helping the grass get the moisture it needs to survive hot, dry summers. It means any rainfall or irrigation stays available to the lawn, and reduces how much you need to water when you do turn on your sprinklers.
Professionals swear by lawn wetting agents, and homeowners should use them as part of their annual lawn care regime, as they can offer short-term summer relief or long-term proactive benefits. Let’s look at how they work and when you should use them on your lawn to get the most benefit. (This lawn wetting agent, available at Amazon, comes with a sprayer that connects to your garden hose to apply it across the lawn.)
What Does a Lawn Wetting Agent Do?
Lawn wetting agents, also known as soil surfactants, are chemical compounds that help water to penetrate the grass and spread evenly throughout the ground. The product reduces the surface tension of the water, helping it infiltrate and spread through the lawn.
Jonathan Davis, a grass expert at Lawnsmith, explains how water can often ‘just run off the soil’ when the ground is parched and hard during a hot, dry summer. But altering that surface tension makes a huge difference in helping moisture penetrate the turf.
‘By disrupting the water’s surface tension, a wetting agent immediately allows it to filter down through the soil, right to the roots where it’s most needed,’ he says.
‘A perfect example of water’s surface tension at play is the old party trick where you balance a coin on top of a glass of water. And when you put a drop of washing up liquid in the water, the surface tension has broken, and the coin immediately sinks.’
When moisture penetrates deeper into the soil, it reaches the root zone, where your grass needs it most. The water won’t run off or sit on the lawn only to be lost to evaporation, which is crucial during hot summers.
Plus, it helps you reduce water waste in your yard. A lawn wetting agent doesn’t replace any need to water a lawn, but it cuts down how much water you need to apply.
‘If grass has entered a dormant state, recovery can be patchy; some areas remain brown while others return to a vibrant green. A wetting agent can revive the whole lawn,’ Jonathan said.
‘So whether it’s a dry lawn that needs reviving, or one that needs protection, a wetting agent is worth every penny.’
When and How to Use a Lawn Wetting Agent
For the best results, it pays to plan your usage of a lawn wetting agent carefully. Whether you want to cover an entire lawn or use it to treat stubborn dry, brown patches in the grass, Jonathan has one key tip for using the product.
‘To get the best out of your product, apply it to your turf before watering or rainfall,’ he says, as this ensures the product is active and working before any moisture hits the lawn, whether courtesy of natural rainfall or gardeners watering their grass.
‘If just treating specific dry areas, spread it further than the initial patch to ensure thorough coverage,’ adds Jonathan.
Fast-acting liquid lawn wetting agents can provide immediate relief, usually less than 30 minutes. These products are perfect for immediate results and can be applied before any summer rainfall or irrigation.
For a longer-term plan to avoid dry summer lawns, Neil Stubley, Wimbledon’s head of courts and horticulture, advises applying a lawn wetting agent earlier in the season.
He told The Guardian newspaper: ‘I’d recommend using a wetting agent to prepare your lawn for dry, summer conditions, supporting its hydration ahead of warmer weather.’
Granular lawn wetting agents can be applied to release their compounds slowly over an extended period. These are usually applied with a lawn spreader over larger areas – like this push broadcast spreader at The Home Depot. They take longer to activate, but their benefits can be felt for longer, up to six months.
Such products can be used as part of a spring lawn care regime. This ensures the wetting agent is established in the soil to protect your lawn in a heatwave.
Shop the Best Wetting Agent for Lawns
A natural lawn wetting agent made from Yucca schidigera to mix with water and apply to hydrophobic soil that repels rather than absorbs water.
A wetting agent to decrease surface tension and loosen hard soils. It can be applied using a garden sprayer or a hose-end sprayer, also available at Walmart.
Hydretain granules are a bit different from wetting agents. They convert moisture vapor in the soil into usable water droplets, keeping a lawn hydrated for longer between rainfall or waterings.
One thing to avoid is watering the lawn at night. It may be convenient to set the sprinklers going overnight, but it creates ideal conditions for fungal diseases to thrive. The best time to water a garden is in the morning. If you can’t do it then, early evening is OK as the grass has time to dry before nightfall.
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