Liquid Lawn Feed

Liquid lawn feeds are absorbed quickly by grass plants, providing almost immediate results and green up. Liquid lawn feeds are best utilised alongside seasonal applications of granular lawn fertilisers, to rapidly provide additional nutrients just when you need them.

Liquid lawn feeds provide an additional edge to granular lawn feeds, as they are absorbed directly through the leaf of the plant, to complement the granular fertiliser absorbed through the roots. Together, this provides the most efficient and effective uptake from each and every grass plant.

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What is liquid lawn fertiliser?

Liquid lawn fertiliser is a liquid based fertiliser that is mixed with water before application and then added to the plant and left to dry. It is then absorbed through the leaf of the plant rather than the root, helping provide a quick nutrient boost.

Liquid lawn fertiliser can be used every couple of weeks during the growing season to help create a beautiful, lush, healthy lawn.

How to apply liquid lawn fertiliser?

Always follow the instructions on the back of the liquid lawn fertiliser bottle. Once mixed to the correct specification, we recommend using a watering can, with the sprinkler attachment, to evenly distribute this over your lawn. Make sure to choose a dry day with no rain in the forecast to allow the liquid fertiliser to dry and be absorbed by the grass.

What are the benefits of liquid lawn feed?

There are a few key reasons people choose liquid fertiliser over granular feeds, and it mostly comes down to speed and control. Because it’s absorbed through the leaves as well as the roots, the grass responds much quicker and you’ll often notice a difference in colour within a few days, especially in spring and early summer.

It’s also easier to apply accurately. Whether you’re treating the whole lawn or just working on thinner patches, liquid lawn feed can be spread evenly with a watering can or sprayer which makes it particularly useful if you're working in smaller spaces or trying to avoid overfeeding around paths, beds, or edges.

Another benefit is timing. Liquid grass feed works well during cooler spells when the soil isn’t quite warm enough for granular fertilisers to break down. You can also use it after scarifying, during dry weather, or if the lawn’s showing signs of stress.

Some people also choose to use Liquid Feed alongside traditional granular feeds, while others rely on it as a standalone option. What works best for you will depend on how closely you manage your lawn and what sort of results you’re after.

How long does it take for liquid lawn fertiliser to work?

Due to the quick absorption of liquid lawn fertiliser, you should begin to see noticeable differences to your lawn within just a few days!

Can I use granular and liquid lawn feed together?

Yes, you can use them both together and it is often advised to. However, they should be applied at slightly different times and for different purposes to stop your lawn from being overfertilised or burnt. Use granular as your main fertiliser every 6-8 weeks and then liquid fertiliser can be added every 3-4 weeks as a booster. Avoid applying them on the same day and always read the specific application recommendations.

Can I use liquid fertiliser all year round?

Yes, but you’ll want to switch formulas depending on the season. Use high-nitrogen feeds in spring and summer and move to a winter blend in the colder months.

Is liquid fertiliser safe for pets and children?

Once the lawn is dry, it’s generally safe. As a precaution, keep pets and children off the grass until the surface has fully dried.

Can I combine liquid fertiliser with moss killer or weed treatments?

Space applications out if you’re using separate products or go for a combined treatment like Moss Attack if you want to tackle both in one go.

What’s the difference between seaweed and standard liquid feeds?

Seaweed feeds support soil health and root strength rather than just top growth. They’re ideal for improving long-term resilience or helping the lawn recover after stress.

What is the best liquid lawn feed for my lawn?

Boston seeds KissMyGrass liquid fertilizer range includes a mix of general feeds, seasonal blends, and specialist treatments which are all designed to give you more control over how and when your lawn is fed.

General & Year Round Lawn Feeds

Year Round Rapid Green is a quick-acting liquid lawn fertiliser with a high nitrogen content. It’s ideal when you need a fast green-up or want the lawn to bounce back after a cut. You’ll usually see a difference in colour within a few days, especially in spring and early summer when growth is active.

Seasonal Boosters

Spring & Summer Boost is a reliable seasonal lawn fertiliser for use during the main growing months. Not only is it high in nitrogen and potassium, but it will also help support top growth while encouraging strong root development. On the other hand, our Autumn & Winter Vitality fertiliser takes a more balanced approach and helps to build resilience in cooler months without pushing soft green growth that won’t last.

Specialist Treatments

For lawns that need extra support, our fertiliser range includes a number of specialist options. Our Seaweed Liquid Fertiliser helps improve disease resistance and supports soil biology over time while the Moss Attack treatment combines feed and moss control in one pass, making it a good option after scarifying or during damp spells when moss tends to return. There’s also a Winter Defender option which is designed to strengthen the grass as we move into the colder weather and will actively help reduce the risk of overall winter stress.

Each feed in our range is designed to be diluted and applied with a watering can or sprayer. The right choice depends on the time of year and what your lawn actually needs and not just what the calendar says.

Why choose Boston Seeds?

With over two decades of experience, Boston Seeds is a family-run business whose passion lies in creating beautiful outdoor spaces with high-quality lawn grass and wildflower seed mixtures. We stock everything you need to create a beautiful lawn or wildflower meadow, including lawn fertiliser to seed spreaders.

When buying from Boston Seeds, you are buying:

Quality assurance: Every one of the lawn fertilisers we stock has been expertly formulated and rigorously tested to ensure they help create beautiful, lush and healthy lawns.
Customer satisfaction: We take pride in providing the best possible service and product for our customers. If you’ve got any questions or concerns our team is always happy to help.
Expert advice: We are always on hand to help provide expert advice on planting and sowing your lawn seed to ensure you get the best lawn. Take a look at our advice section or get in touch.
Versatility: Whatever your needs and requirements are, we’ve got the lawn fertiliser for you. Whether you’re looking for spring fertiliser, or something to help protect your lawn in the winter we’ve got it all.

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About Us

We’re dedicated to making the highest quality, professional outdoor products available to everyone to truly make the most of their outdoor spaces - lawns, gardens, landscapes, equine, sports and agriculture. Trusted by over 200,000 happy customers with a reputation for professional quality, world-class service and outstanding value for everyone, since 2002.