Best Slow-Release Lawn Fertilisers of 2026

The Boston Seeds Lawn Fertiliser is designed for optimal growth from March to September, ensuring you apply the right nutrients when your lawn needs them most. With an NPK ratio of 20-6-8, it provides a balanced blend of nutrients for robust root development and vibrant foliage. The phased release of nutrients means you only need to apply it once for up to six months of sustained support, making lawn care simple and effective. Its granular formulation allows for steady nutrient supply, promoting consistent lawn health and vitality.

The Elixir Gardens Lawn Fertiliser is designed specifically for the British climate, making it ideal for your garden. It contains 5.2% sulphur, which promotes overall grass health, and 2.6% magnesium, helping to harden turf during winter. This fertiliser reduces plant stress and supports healthy root development through the colder months. It also protects your plants from harsh winter conditions like strong winds and snow, ensuring your lawn stays vibrant and resilient.

The Miracle-Gro Lawn Food is a high-quality slow-release fertiliser designed to nourish your lawn throughout the growing season for up to three months. This product ensures that your lawn remains thicker and greener without experiencing surge growth, giving you a lush garden to enjoy. You can expect fast greening within just seven days, allowing you to see quick results. Ideal for application between March and September, this lawn food provides deep, uniform greening while slowly feeding your grass, making it a convenient choice for any homeowner.

The A1 Lawn Fertiliser is designed to rejuvenate your lawn after winter and maintain its health during the warmer months. With a high nitrogen content, it promotes lush, green growth, making your grass look vibrant. The added phosphorus strengthens roots and shoots, while potassium ensures a hardy and durable lawn. Additionally, this fertiliser includes iron and magnesium, enhancing photosynthesis and overall greenness. It's easy to apply, requiring no mixing, making it a convenient choice for every gardener.

Nutrigrow Lawn Fertiliser is designed to provide a lasting boost to your lawn. With a longevity of six weeks, you can enjoy the benefits without frequent reapplication. You will notice a positive response from your turf within just seven days, making it ideal for quick results. The granular form allows for easy application and even distribution, ensuring that every part of your lawn receives the nutrients it needs. This product releases nutrients slowly, preventing rapid top-growth and promoting healthier turf overall.

The Nutrigrow Pro Fertiliser is designed to enhance your lawn with its effective nutrient balance. It offers a longevity of six weeks, ensuring that your turf remains nourished throughout the season. You can expect a noticeable response from your grass within just seven days, making it ideal for quick results. With granule dispersal taking an average of four to five days, you can easily apply it and see improvements without delay. This fertiliser covers an impressive area of up to 570m², perfect for larger gardens.

A1 Lawn Fertiliser is designed specifically for the autumn and winter months, providing your grass with essential nutrients to keep it healthy and lush. Its high potassium content promotes strength and durability, ensuring your lawn withstands the colder weather. Additionally, the phosphorus aids in developing robust roots and shoots, while nitrogen enhances the greenness of your grass. With its moss-killing properties, this fertiliser not only keeps your lawn looking good but also simplifies spring maintenance by preparing your lawn for scarifying.