New Zealand spinach
Tetragonia tetragonioides is suitable for hydroponic self-sufficiency in a broad drip-irrigated substrate bed.
Why this crop is worthwhile
New Zealand spinach thrives in warmth and spreads more widely than true spinach. The question is not only whether a plant grows hydroponically, but also whether its edible proportion, growing time, light requirements, workload and storage life suit the household.
System and root space
A broad drip-irrigated substrate bed is recommended. The root zone must remain evenly moist, well aerated and protected from light. Record the source water and nutrient solution; returns, pipes and reservoirs must remain accessible and easy to clean.
Relevant system page: Drip irrigation and Dutch buckets
pH, EC and climate
A cautious starting range is pH 5.8–6.5 and EC 1.5–2.2 mS/cm at 20–28 °C. These are not universal target values: the cultivar, age, light, source water, temperature, measurement method and growth stage may require adjustments.
Sowing and crop management
Allow for its spreading habit and trim the shoots regularly before they shade neighbouring plants. Run a small preliminary trial to check germination and behaviour in the system. Space plants approximately 35–50 cm apart and regularly inspect root health, leaf colour, pests and even water distribution.
Harvesting and storage
Harvest young shoot tips repeatedly. For storage, refrigerate briefly or blanch and freeze. Process only healthy, clean plant material and follow the food-hygiene requirements of the chosen preservation method.
Troubleshooting
- Long, soft plants: Check light levels, spacing and temperature.
- Leaf-edge damage or chlorosis: Check not only EC, but also pH, water hardness and the nutrient formulation.
- Brown roots: Investigate temperature, oxygen, hygiene and waterlogging.
- Uneven yields: Compare flow, emitters, plant spacing and cultivars.