If you want healthy plants, the best time to fertilise your garden in New Zealand is every 4 to 8 weeks aligned with the seasons - not every week and not just once a year. Understanding when soil needs support is more important than how much fertiliser you use. Why timing matters more than quantity: Plants don't absorb nutrients instantly. Soil life - earthworms, microbes, fungi and organic matter - process nutrients first, then release them gradually for roots. That means fertilising at...