How Long does Lawn Fertilizer Take to Work?
There are three factors that control how long fertiliser takes to work. The availability of moisture, the temperature and the type of fertiliser.
Lawn Soil Moisture
The only way a plant can utilise fertiliser is if water is available to move the nutrients through the plant. A bit like your blood stream. If the feed is dry and spread on the turf then moisture will also be needed to dissolve it into the soil so the grass roots can then access it. No moisture and not only will you grass not green up it may go into reverse and dry up!
Temperature
You can have lots of moisture in the winter, but grass and other plants don’t grow because the temperature is too low. This means you can expect fertiliser to take several weeks to work in cooler temperatures. Generally, you will see little grass growth below 80C which is why we recommend applying our Winter Green Fertiliser during a mild spell to get maximum winter green from it.
Types of Lawn Fertiliser
To keep this simple we will consider 3 types. Their reaction times to the fertiliser is based on good growing conditions with adequate moisture and warmth.
Liquid or Soluble Fertiliser
This is absorbed through the leaf and greens the lawn in days rather than weeks. This is analogous to an injection for you being fast and a tablet being slow. Liquid feeds will last around 4 weeks.
See How to Use Liquid Lawn Food
Granular Fertiliser
This is plain quick release fertiliser or perhaps packaged as a weed and feed, 4 in 1 or After-cut type product. All of the fertiliser is usually available to react and feed the lawn within 7-10 days and will generally last a few weeks at the most.
Slow-release Granular Fertiliser
These are feeds more orientated to the quality end of the market and for professionals. They are normally just fertiliser without pesticides or moss killer which considerably improves safety and flexibility. The fertiliser would release its nutrients to the grass in stages. Perhaps a third would be quick release which would cause the grass to green-up within 7-10 days and last 4 weeks. A further third would become available after 4 weeks and feed for a further 4 weeks. The final third would release on week 8 giving a total feeding duration of 12 weeks.
That’s the theory anyway, but varying weather patterns and mowing regimes can affect this by 2-3 weeks overall. Having said that, slow-release fertilisers are the best ones for the lawn, for ease of use and for safety of family and many pets.
For more detail go to Slow-Release Lawn Fertiliser
Fast Acting and Long Lasting Fertilisers
More Lawn Food Do's and Don'ts
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Follow a few simple rules to apply your lawn fertiliser and get the best results from your grass whether it's a spring, summer or an autumn feed
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For convenience you can fertilise the seeded lawn area on the day of sowing however, due to changing weather patterns this may not always be best.
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Lawn Food Do's and Don'ts
You can save time and money and get a better result if you use the correct fertiliser for your lawn. Adjust for these and your grass is 90% of the way there.
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The soil in your lawn controls the amount of fertiliser, air and water to the grass roots, therefore sandy and poor soils should be fed more than clay soils
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Lawn Food Do's and Don'ts
Knowing what to use to feed your grass in spring can make a big difference to your lawn whilst saving you time and money.
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Lawn Food Do's and Don'ts
In summer you can use a granular or liquid fertiliser. However, the conditions for application are very important during the warmer and dryer summer months.
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Lawn Food Do's and Don'ts
Autumn fertiliser needs to be able to support the grass nutritionally, give maximum colour to make use of lower autumn light levels and promote deeper roots.
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Lawn Food Do's and Don'ts
There is plenty of root growth in winter as the lawn soil at root depth is invariably warmer than the air. Keeping the roots fed means a healthy resilient lawn.
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Lawn Food Do's and Don'ts
Clay soil tends to be heavy and dense, with poor drainage and good nutrient retention. Your lawn feed should take this into consideration.
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Lawn Food Do's and Don'ts
Sandy soil tends to drain quickly and lacks essential nutrients, so the best lawn fertilizer should provide a generous level of prime nutrients to compensate.
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Seaweed promotes health, goodness and biological activity within the grass and the soil producing a greener, stronger and more disease resistant lawn.
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Lawn Food Do's and Don'ts
Using a proven mix of nutrients you can rapidly enhance the green in your lawn in less than a day. Ideal for application between seasonal feeds or as a standalone fast green-up before an event.
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Lawn Food Do's and Don'ts
Liquid feeding of the lawn is suitable from late spring to early autumn during the main growth period in warmer weather.
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Lawn Food Do's and Don'ts
Here are two simple ways to use weed killer and soluble or granular lawn fertiliser that is easy for you, safe for the grass and deadly for the weeds.
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Lawn Food Do's and Don'ts
When spreading fertiliser on the lawn you need to do two simple things otherwise you'll damage the grass: spread the correct amount and put it on evenly.
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Lawn Food Do's and Don'ts
There is only one way to spread fertiliser on your grass safely and evenly and that is with a rotary or broadcast spreader; not by hand or with a drop spreader
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Lawn Food Do's and Don'ts
Watering-in a fertiliser treatment is necessary for fine powdery products such as weed and feed so try using a fertiliser that doesn’t need watering in!
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Lawn Food Do's and Don'ts
Lawn fertiliser may not completely dissolve in to the grass for a variety of reasons. Most of them are good and better for a healthy lawn!
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Lawn Food Do's and Don'ts
Use a granular or pelleted feed without weed killer or iron that is slow-release. These settle deep into the grass pretty much out of reach of dogs and cats.
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Lawn Food Do's and Don'ts
Aftercut is very similar to ‘weed and feed’. There are those with weed killer and those without. Do not use the one with weed killer on a regular basis.
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Lawn Food Do's and Don'ts
'Weed and feed' is a clever lawn care idea. The problem is, for most people it doesn't work leaving stripes, burnt grass and even bigger weeds
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Lawn Food Do's and Don'ts
The shelf life of fertilizers can vary widely based on type of fertilizer, storage conditions, and packaging. Here's a guideline for common types of fertilisers.