Best Slow-Release Multi-Purpose Fertilisers of 2025

The Gro-Sure Plant Food offers a convenient solution for nourishing both indoor and outdoor plants. This 2kg all-purpose fertiliser releases nutrients slowly over six months, ensuring your plants remain healthy and vibrant. It combines fast-acting nutrients that boost flowers and root growth with slow-release elements that support sustained feeding. You can easily mix the granules with compost or topsoil before planting, or use them as a top dressing, making it a versatile addition to your gardening routine.

The Miracle Gro Plant Food Bundle offers everything you need to nurture your plants effectively. The 900g Slow Release 6 Month Plant Feed Granules provide a consistent supply of essential nutrients, ensuring your plants grow strong and healthy over time. The 800ml Concentrated Liquid Plant Food delivers a powerful mix of micronutrients, perfect for those looking to enhance their plants' growth and colour. This all-purpose formula is suitable for both indoor and outdoor plants, making it a versatile choice for any gardening enthusiast.

The Elixir Gardens Nitrogen Fertiliser offers a potent 46% nitrogen content, making it an excellent choice for promoting robust plant growth. Its soluble prilled form allows you to easily apply it through irrigation systems, ensuring that nutrients reach your plants effectively. You can also dissolve it in water for foliar application, which enhances nutrient absorption. This fertiliser provides quick nitrogen availability, supporting vigorous growth, especially during critical stages, allowing you to achieve lush, healthy plants.

Osmocote Pro Fertiliser provides all the nutrients your plants need throughout their entire growth cycle. It is specially designed to be mixed into growing media, ensuring that your plants receive consistent nutrition. With a high NPK content of 17-9-10, it supports robust plant development. The product also includes a full trace element package, which enhances overall plant health and growth. You will find it easy to use, making it a convenient choice for gardeners of all levels.

Florasoul® Seaweed Fertiliser is an organic plant booster that provides essential nutrients through slow-release granules. These pearls are rich in amino acids, vitamins, and natural hormones, ensuring your plants thrive with every watering or rain. Unlike liquid fertilisers, this product lasts up to three months, creating the ideal environment for lush growth and flavourful produce. It's also easy to use—simply sprinkle the granules around your plants or mix them with seeds, without any risk of damage.

The Truoli Drip Feed Fertilisers offer a convenient solution for plant care. With their slow-release design, these 30ml feeders gradually provide essential nutrients over time, ensuring your plants receive consistent nourishment. You can easily apply them by inserting the feeder into the soil near the root zone, making feeding effortless. This pack contains 10 individual feeders, allowing you to cater to multiple plants or replenish as required, promoting healthy growth and vibrant foliage without hassle.

The Osmocote Fertiliser Tablets are designed to provide consistent nourishment for your plants over a period of 5 to 6 months. With 50 tablets in each pack, you can easily feed multiple plants, ensuring they receive the nutrients they need. Each tablet weighs 5 grams, making them convenient to use and easy to apply. This commercial-grade fertiliser is perfect for both indoor and outdoor plants, helping you maintain healthy growth and vibrant foliage without the hassle of frequent feeding.

Elixir Gardens Poultry Manure is a versatile fertiliser, perfect for enhancing your garden. It is completely natural, ensuring no harmful additives affect your plants. This makes it suitable for all types of greenery, including lime-hating plants. By using this product, you can revive your soil, promoting the health of local earthworms and boosting essential nutrients. Additionally, it is free from debris and insects, providing you with a clean, mess-free solution for your gardening needs.

Incredicrop Fertiliser is a multi-purpose, controlled slow release fertiliser that helps you maximise your garden’s potential. With just one application, you can expect up to 400% more blooms, leading to significantly increased fruit yield. This product offers a perfect balance of nutrients essential for the health of your edible crops throughout the growing season. Whether you’re tending to vegetable gardens, greenhouses, or container plants, this reliable fertiliser ensures optimal performance and growth.

The GUARD-EN-FORCE Bone Meal is a slow-release organic fertiliser designed to enhance root development for a variety of plants. It is rich in essential nutrients like phosphorus, calcium, and nitrogen, promoting healthier growth and greener foliage. You can apply it pre-planting or to established plants, making it versatile for your gardening needs. By using this fertiliser every 4-6 weeks, you can improve soil fertility and help your plants thrive throughout the growing season.