GT Complete Weed Feed & Moss Killer Fertiliser 20kg is a professional-grade, triple-action lawn treatment that combines powerful weed control, moss elimination, and turf feeding in one easy application. Designed for performance across large areas, this blend is ideal for use on domestic lawns, commercial landscapes, and large-scale grounds maintenance. The formulation kills common broadleaf weeds, blackens moss rapidly, and stimulates thick, green growth through its nitrogen-based feed.
A go-to solution for landscapers, gardeners, and lawn care professionals, this 20kg product ensures fast, visible results. Whether you're treating a tired lawn or maintaining pristine turf, this high-coverage solution delivers convenience and quality in a single treatment.
Features & Benefits
All-in-one formula: fertilises grass, controls broadleaf weeds, and kills moss
Fast moss blackening via iron sulphate for easy raking out
Weedkiller targets dandelions, clover, daisies and more
Encourages a healthy, vibrant green lawn
Larger 20kg format – ideal for larger gardens or contractor use
Covers up to 570m² at standard rate
Applications
Domestic and professional lawn care
Parks, estates, and public green spaces
Sports turf and large lawn areas
Landscaping maintenance contracts
Application Rate:
Apply at 35g/m². One 20kg bag treats up to 570m².
How to Apply:
Apply evenly using a rotary or drop spreader for consistent coverage.
Use on dry grass when rain is not forecast for 24 hours.
Avoid mowing 3 days before and after application.
Water in if dry weather persists for more than 2 days post-application.
Rake out blackened moss 1–2 weeks after treatment for best results.
Formulation:
Nitrogen (N): 10% – Promotes lush, green growth and helps grass recover from weed and moss damage by boosting leaf and shoot development.
Phosphate (P₂O₅): 2% – Supports early root growth and establishment, especially useful for stressed or patchy areas of lawn.
Potassium (K₂O): 2% – Aids in overall plant health and improves stress tolerance, particularly in drier summer conditions.
Iron (Fe): 8% – High iron content blackens and scorches moss quickly while also giving the lawn a deep, rich green colour. Selective Herbicide: Targets a wide range of broadleaf weeds

Specification Details
Product Name GT Complete Weed Feed & Moss Killer
Function Lawn feed, weed killer, moss control
Nutrient Content Contains nitrogen & iron sulphate
Herbicide Type Selective for broadleaf weeds
Iron Content Yes – for moss blackening
Format Granular
Bag Size 20kg
Application Rate 35g/m²
Coverage 570m² per bag
Application Method Spreader (rotary or drop)
Recommended Use Period Spring to early autumn