Culterra Organic Lawn Fertilizer 7:1:5 (19) is a specialized, organic-based nutrient mix designed specifically for South African lawns. The "(19)" refers to the total percentage of the three main nutrients (Nitrogen, Phosphorus, and Potassium) in the bag.
This fertilizer is highly popular because it combines immediate chemical availability with long-term organic soil health.
1. Understanding the 7:1:5 Ratio
The numbers represent the NPK ratio, which tells you what the fertilizer does:
- 7 (Nitrogen): The high nitrogen content promotes rapid, lush green leaf growth. This is what gives your lawn that "carpet" look.
- 1 (Phosphorus): A lower amount is needed for established lawns, focusing on root strength without over-stimulating the plant.
- 5 (Potassium/Potash): Helps with disease resistance and drought tolerance, making the grass "tougher" against the South African sun.
2. Key Benefits
- Organic Base: Unlike pure chemical fertilizers, this contains organic matter that improves soil structure and encourages earthworms and beneficial microbes.
- Slow Release: The organic components break down slowly, providing a steady "trickle" of nutrients rather than a single spike that could burn the grass.
- Safe for Established Lawns: It is the ideal "maintenance" fertilizer for Kikuyu, LM, and Evergreen lawns.
3. Application Guide
- Rate: Apply at a rate of approximately 30g to 50g per square metre. A 10kg bag will cover roughly 200m² to 300m².
- Timing: Best applied in Spring and Summer (every 6–8 weeks).
- Watering: Crucial Step: Always water the lawn thoroughly immediately after application to wash the granules off the leaf blades and into the soil. This prevents "fertilizer burn."
