Radishes
Raphanus sativus var. sativus is well suited to hydroponic self-sufficiency in a loose coco–perlite mix.
Why this crop makes sense
The crop has a short growing period and produces a compact storage organ. The decisive question is not merely whether the plant grows hydroponically, but whether its edible yield, growing period, light requirements, workload and storage life suit the household.
System and root space
A loose coco–perlite mix 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.
Suitable system pages: Compare growing systems
pH, EC and climate
A cautious starting range is pH 5.8–6.5 and EC 1.2–1.8 mS/cm at 12–22 °C. These are not universal target values: cultivar, age, light, source water, temperature, measuring method and development stage may require adjustments.
Sowing and crop management
Excessive nitrogen can promote leaf growth at the expense of the swollen roots. A small preliminary trial checks germination and system performance. Space plants approximately 5–8 cm apart and regularly inspect root health, leaf colour, pests and uniform water distribution.
Harvesting and storage
Harvest when the roots reach the diameter typical for the cultivar. For storage, refrigerate briefly or pickle them. Process only healthy, clean plant parts and follow the food-hygiene requirements of the chosen preservation method.
Troubleshooting
- Tall, soft plants: check light levels, spacing and temperature.
- Leaf-edge damage or chlorosis: check not only EC but also pH, water hardness and nutrient formulation.
- Brown roots: investigate temperature, oxygen supply, hygiene and waterlogging.
- Uneven yields: compare flow rates, emitters, plant spacing and cultivars.