Products mentioned in this guide
ORGANIC LINK Slow Release Fertiliser 25KG - Balanced Nutrition for All PlantsSee price and delivery
GNP IRON TOPDRESS Fertiliser 20KG - Slow-Release Formula for Dark Green LawnsSee price and delivery
CK 55 Fertiliser 25KG – Balanced Crop Nutrition for Improved YieldSee price and deliveryOrders are dispatched within 24 hours from our Gold Coast store. Delivery starts from $17, priced by weight and postcode at checkout. In-store pickup at Arundel is free. Always check the label.
A slow-release fertiliser is made to release its nutrients over a longer period than a quick-release product. How long it lasts depends on the product, so the pack and label matter more than the word on the front. This guide lists five fertilisers we sell whose own packs say slow release, with the facts from each pack, the pack size and the price. Prices and stock last checked 12 November 2026.
How to choose a slow-release fertiliser
- Plants: use a product whose pack lists the plants you are feeding (lawn, vegetables, natives, trees and shrubs).
- Analysis: the printed N-P-K numbers are the percentages of nitrogen, phosphorus and potassium. Compare them with what your plants need.
- Rate and timing: use the rate and timing on the pack; our product pages show label directions on the Application Rates tab.
- Spreader: check the label for the type of spreader. For example, the DMR label says not to use a drop-type spreader.
- Pack size and price: compare cost per kilogram as well as the bag price.
The 5 slow-release fertilisers at a glance
| Fertiliser | What the pack says | Analysis | Packs | Price (inc GST) |
|---|---|---|---|---|
| Organic Link Slow Release | Plant of Health slow release fertiliser; complete care for lawns, plants, palms, vegetables, natives and shrubs; added zeolite for water retention | See the pack | 2.5 kg, 6.5 kg, 25 kg | $16.89, $33.00, $68.20 |
| Plant of Health Lawn and Turf | Blended granular lawn fertiliser; the pack lists couch, shade, buffalo and broadleaf lawns, turf fields and parks, and says slow release | N 11.9, P 2, K 8 | 8 kg, 25 kg | $41.56, $76.45 |
| Turf Master Fines | Qld Organics organic lawn and garden fertiliser with blood and bone; slow release and naturally composted | See the pack | 25 kg | $23.10 |
| Organic Booster | Qld Organics all purpose organic garden fertiliser; naturally composted, slow release, 100% natural | On the back of the pack | 25 kg | $20.00 |
| DMR Soil Conditioning Blend | Slow release pre-plant (starter) fertiliser with water crystals | N 7.4%, P 0.8%, K 6.3%, S 2.35%, Ca 1.96% | 15 kg | $326.70 |
Delivery from $17, priced by weight and postcode at checkout. Free pickup at Arundel.
The 5 slow-release fertilisers in detail
1. Organic Link Slow Release
A Plant of Health slow release fertiliser. The pack says complete care for lawns, plants, palms, vegetables, natives and shrubs, with added zeolite for water retention, and that it is Australian made and owned. The 25 kg bag needs a two person lift; the tub (2.5 kg) carries a registered organic ingredients mark and says it is now in a pellet. Also sold as 6.5 kg and 2.5 kg. See the Application Rates tab and the directions on the pack.
2. Plant of Health Lawn and Turf
A blended granular lawn fertiliser, N 11.9, P 2, K 8 as printed on the pack. The pack lists couch, shade, buffalo and broadleaf lawns, turf fields and parks, and says low odour, slow release and easy spread granules. The 8 kg pack is marked as covering 160 to 200 m², and its pack says to apply with a spreader at 30 to 50 g per square metre in spring, summer and autumn or as required, and to water in well. Also sold as an 8 kg pack.
3. Turf Master Fines
A Qld Organics organic lawn and garden fertiliser with blood and bone. The pack says slow release and naturally composted, and carries a BFA registered product mark. Read the pack for directions.
4. Organic Booster
A Qld Organics all purpose organic garden fertiliser. The pack says naturally composted, slow release and 100% natural, with a BFA registered product mark. The analysis is on the back of the pack.
5. DMR Soil Conditioning Blend
A slow release pre-plant (starter) fertiliser with water crystals, 15 kg. Label analysis N 7.4%, P 0.8%, K 6.3%, S 2.35%, Ca 1.96%. Do not apply with a drop-type spreader.
Fertilisers that are not on this list
CK 55 is a blended NPK (14-15-13 + 1 S) and urea 46-0-0 is a straight nitrogen fertiliser; neither is sold as slow release, so they are in our fertiliser guide instead. GNP Iron Topdress 20 kg is not on this list because its product page does not state a release type; read the analysis and directions on the bag.
How to apply slow-release fertiliser
Read the whole label first and use the rate and timing it gives. Spread granules evenly with a spreader of the type the label allows and water in as the pack directs. Using more than the label rate can burn or damage plants.
Frequently asked questions
How often should I apply a slow-release fertiliser?
Follow the timing on the pack. For example, the Plant of Health Lawn and Turf pack says to apply in spring, summer and autumn or as required; other products have their own directions on the pack and the Application Rates tab.
Can I use slow-release fertiliser in pots?
Use only a product whose pack lists the plants you are feeding and follow the pack directions. If you are not sure, call us before you buy.
Is slow-release fertiliser safe around pets and children?
Read the safety statements on each pack and keep children and pets away as the label directs. We do not make a general safety claim for any product.
What is the difference between slow-release and quick-release fertiliser?
A slow-release product is made to release its nutrients over a longer period. A quick-release or straight fertiliser such as urea 46-0-0 supplies nitrogen without being sold as slow release. Check the pack for how a product is sold.
Related guides
The 15 fertilisers we sell, plus CK 88; the role of fertilisers in a healthy lawn; feeding warm-season lawns.
Where to buy on the Gold Coast
Garden Nursery Products is based at Arundel on the Gold Coast. Order online with delivery from $17, priced by weight and postcode at checkout, or pick up at our Arundel store (Monday to Friday 7:30am to 4pm). Not sure which fertiliser to choose? Call us on 07 5537 4585 before you buy.
Last reviewed 12 November 2026 against our product pages. Prices include GST and change. Always read and follow the label.