Slow Release Lawn Fertilizer 25-5-10 NPK - Deep Feed up to 110 Days

Our review of this slow release lawn fertilizer finds it best for homeowners and groundskeepers who want steady, long-lasting greening without daily attention. The single biggest reason to buy is its 65% granular nitrogen formula that combines slow and quick release action to feed lawns up to 110 days, producing deep green growth and stronger roots. The reviewer found it especially useful after winter or drought stress when a sustained nutrient supply matters more than a quick flush.

Key Features

• 65% granular nitrogen: Delivers a prolonged supply of nitrogen that supports steady leaf growth and visible greening over weeks rather than days.
• 25-5-10 NPK blend: Provides a high nitrogen ratio for rapid green-up while supplying phosphorus and potassium to support root development and stress tolerance.
• Feeds up to 110 days: The slow release formulation reduces the need for frequent applications, saving time across a full season.
• Pet and kid safe when used as directed: Allows families to use outdoor spaces with more confidence after application instructions are followed.
• Sulphate of potash included: Adds sulphur and potassium that help soil health and deeper root growth rather than only surface greening.

Who It's For

This fertilizer is ideal for residential lawns, small sports fields, and anyone who prefers a lower-maintenance feeding schedule. If you want a single product to kickstart spring growth and then support the lawn for several months, the combination of quick and slow release nitrogen is appropriate.

It is less suited to gardeners who need very low-nitrogen blends or who require organic-only products, since this is a granular, concentrated NPK formula. Those seeking immediate, short-lived green-up only may prefer a fast-release product instead.

Pros & Cons

Pros

• Highly effective greening and steady growth thanks to the 65% granular nitrogen content.
• Long feeding period up to 110 days reduces frequency of applications and effort.
• Easy to spread granular form that customers report as straightforward to apply with a spreader.
• Formulation includes sulphate of potash for improved root health and soil benefits.

Cons

• Some users consider the cost higher than basic fertilizers, making it a larger upfront purchase for a 20kg bag.
• Not an organic-only product, so it does not suit strictly organic lawn care regimens.

Specifications

Product name	Slow Release Lawn Fertilizer 25-5-10 NPK
Nitrogen formula	65% granular nitrogen (slow and quick release)
Guaranteed analysis	25-5-10 NPK blend
Coverage period	Feeds up to 110 days
Bag size	20kg (44lbs)
Safety	Pet and kid safe when used as directed
Additional nutrients	Sulphate of potash for added sulphur and potassium

Our Verdict

This slow release 25-5-10 lawn fertilizer is a strong choice for homeowners who want reliable, long-lasting greening and deeper root benefits without frequent reapplication. Although the 20kg bag is a noticeable investment, the extended feed period and ease of spreading make it good value for anyone prioritizing sustained lawn health over quick fixes.

Frequently Asked Questions

How long does one application last?
When applied as directed, it feeds the lawn for up to 110 days.

Is this safe around children and pets?
Yes, the product is described as pet and kid safe when used according to the instructions on the label.

What type of lawns benefit most?
High-nitrogen turf varieties and tired lawns responding to spring recovery or seasonal feeding will see the most visible improvement.