Liquid Lawn Fertiliser

Liquid Fertiliser Products Breakdown

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.

Benefits of Liquid Fertiliser

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 to Apply & Best Practices

Most liquid fertilisers need to be mixed with water and applied using a watering can, knapsack sprayer, or handheld applicator. First, give the bottle a good shake, then follow the dilution rates on the label. As a general guide, it’s often around 100ml of fertiliser per 5 litres of water but always check the specific product for individual instructions.

It’s best to apply liquid feed on a dry day with no rain forecast for at least a few hours. Mow the lawn beforehand if needed, then leave it for a day or two after feeding to give the product time to work. Some formulas are foliar feeds only and don’t need watering, while others might. Again, it depends on the product, so don’t skip the label.

During the growing season, you can usually reapply every 4 to 6 weeks. That said, more isn’t always better, and overfeeding can do more harm than good, especially with high-nitrogen mixes. Store any leftover feed somewhere dry and frost-free and give the bottle a good shake before each future use.

If you’re using a moss control or seaweed-based product, the application method is much the same but just be mindful of any extra guidance depending on the time of year or lawn condition.

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.

How we can help!

At Boston Seeds we take pride in excellent customer service. We have been helping create beautiful lawns for years, so whatever you need we can help.

With Next Day Delivery on hundreds of items too, choosing from our extensive range of fertilisers couldn't be easier.  Ordering regularly or looking for large volumes? Click here to apply for a trade account today - we review all applications within one working day.