When it comes to hydroponic gardening, one of the most important factors for healthy, thriving plants is the fertiliser you use. Unlike traditional soil gardening, where nutrients come naturally from the earth, hydroponic plants rely entirely on the nutrients we provide through water. For Kiwi growers using outdoor hydroponic towers, understanding fertiliser is the key to strong growth, delicious flavours, hydroponic store Tauranga and abundant harvests.
What is Hydroponic Fertiliser?
Plant fertiliser for hydroponics is a specially balanced blend of essential nutrients delivered directly to the roots through water. Because hydroponic systems don’t use soil, the plants can’t draw nutrients naturally. Instead, the fertiliser solution provides everything a plant needs to grow—right from the start.
There are two main types of nutrients in any fertiliser:
- Macronutrients – These are the big players, needed in larger amounts. They include nitrogen (N), phosphorus (P), potassium (K), calcium, magnesium, and sulfur. Each plays a role in plant health—for example, nitrogen promotes leafy growth, while potassium strengthens roots and fruit.
- Micronutrients – These are required in smaller amounts but are just as important. They include iron, manganese, zinc, copper, and boron, which all help with growth, colour, and resilience.
Why Fertiliser Matters in Hydroponics
Because hydroponic systems deliver nutrients directly through water, plants can grow faster and often produce higher yields than in soil. However, this also means fertiliser must be carefully balanced. Too much of one nutrient—or not enough of another—can affect plant growth.
For example:
- Lettuce and leafy greens love nitrogen, which helps them produce tender, tasty leaves.
- Fruiting plants like tomatoes or capsicums need more potassium to develop flowers and strong fruit.
The beauty of hydroponic fertilisers is that they can be tailored to suit the plants you are growing.
Using Fertiliser in Outdoor Towers
For New Zealand growers using hydroponic towers outdoors, fertiliser is added directly into the water reservoir. The tower then circulates this nutrient-rich water through the system, feeding each plant evenly.
Some key tips include:
- Follow the instructions – Use the recommended amount of fertiliser. More doesn’t always mean better.
- Check your water – Different areas of New Zealand have varying water quality. Fertiliser blends are designed to balance these differences so your plants always receive what they need.
- Stay consistent – Plants grow best when they receive a steady supply of nutrients. Topping up regularly ensures healthy, balanced growth.
The Local Advantage
At MyGreens, we supply hydroponic fertilisers made to work with our outdoor towers and New Zealand conditions. Because we only sell within New Zealand, our fertiliser solutions are designed with local water quality and growing environments in mind. This ensures your plants get the best possible results without the need for complicated adjustments.
Final Thoughts
Plant fertiliser is the heartbeat of any hydroponic system. It replaces the role of soil and ensures your plants grow strong, healthy, and flavourful. Whether you’re growing fresh lettuces, sweet strawberries, or fragrant herbs, the right fertiliser makes all the difference.