Underlay 4KG NPK 8.4.9

Underlay 4kg NPK 8.4.9 is a professional-grade lawn starter fertiliser formulated to promote rapid turf establishment and long-term grass health from the ground up.

Underlay combines a balanced nutrient profile with slow-release technology, moisture-retaining crystals, and beneficial microbes to create the ideal environment for new turf and seed to take hold. The 8.4.9 NPK ratio delivers essential nitrogen, phosphorus, and potassium for vigorous early growth, strong root development, and improved disease resistance right from the start.

The water-holding crystals reduce watering needs during the critical establishment period, and the microbial component improves soil health and nutrient uptake over time. Spread evenly over prepared soil before laying turf or sowing seed, water in thoroughly, and let it go to work. Safe for all common turf types including Buffalo, Couch, and Zoysia.

Features

• Balanced 8.4.9 NPK ratio for vigorous growth, strong roots, and disease resistance
• Slow-release formula feeds steadily over several weeks after application
• Water-holding crystals retain moisture in the root zone and reduce watering needs
• Beneficial microbes improve soil health and support nutrient uptake
• Safe for all turf types including Buffalo, Couch, and Zoysia

Best For New lawn installations, patch repairs, and any turf or seeding project where strong early establishment and reduced maintenance are the priority.

Coverage One 4kg bag covers approximately 160m² at 2.5kg per 100m². Spread evenly over prepared soil and water in thoroughly to activate crystals and begin nutrient release.

Pickup and Delivery Available for pickup in North Maclean or delivery across South East Queensland. If you need any help, please call us on 1300 136 895. Our team are happy to help.