Slow-Release vs Controlled-Release Fertilisers: What’s the Difference?

Choosing the right fertiliser can make a big difference in the health and appearance of your garden. Two terms you’ll often see are slow-release and controlled-release—and while they sound similar, they work in slightly different ways. Here’s a quick guide to help you understand the difference and when to use each.

Slow-Release Fertilisers

Slow-release fertilisers are typically made from natural materials. They break down gradually in the soil, releasing nutrients over time as microbes and moisture work on them.

Example:
Yates Dynamic Lifter
A well-known slow-release fertiliser made from composted manure. It feeds the soil and plants gradually, while also improving soil structure.

Best for:

• Garden beds and veggie patches

• Improving soil health over time

• Established trees and shrubs

Controlled-Release Fertilisers

Controlled-release fertilisers are manufactured with coatings that control how quickly nutrients are released. The release is more consistent and can be timed to last for months depending on temperature and soil conditions.

Example:
Osmocote® Controlled Release Fertiliser
Available in a range of specific blends (e.g. for natives, flowers, or citrus), Osmocote offers steady feeding with minimal leaching or nutrient loss.

Best for:

• Pots and planters

• New gardens or lawn areas

• Anyone wanting a low-maintenance option

What We Usually Use

In our day-to-day garden and lawn maintenance, we often use Osmocote Controlled Release Fertiliser. It’s a reliable option that works well in a wide range of situations, from garden beds to pots. It provides consistent feeding over time, which helps keep plants healthy with minimal fuss.