Roots and bulbs · Easy
Green onion
Allium fistulosum
Tower, NFT or Kratky.
- EC (mS/cm)
- n/a
- pH
- n/a
- Cycle
- moderate
- Difficulty
- Easy
Sound origin
Allium fistulosum
The green onion (Welsh onion, Allium fistulosum) is native to northeastern China, where it has been grown since at least 200 BC.
Source: Wikipedia
What it provides nutrients
Per 100 g, raw · Green onion (stems and bulb), raw
- Rich in vitamin K
- Rich in vitamin B9
- Source of vitamin C
% of an adult’s reference intake (EU Regulation 1169/2011). “Source of”: at least 15 % per 100 g, “high in”: at least 30 % (thresholds of EC Regulation 1924/2006).
Source: USDA FoodData Central, SR Legacy no. 170005 (not in the Ciqual table)
Key steps
- Grown for its green stems, not the bulb: perfect for soilless growing.
- Sow thickly in clumps, or replant the base of store-bought green onions.
- Cut at 3 cm, regrows several times.
- Very easy in Kratky.
In which system?
| Tower | NFT | Growing medium | Kratky |
|---|---|---|---|
Approximate calendar
| Sowing | Mar., Apr., May, June, July, Aug. |
| Plants | none |
| Harvest | May, June, July, Aug., Sept., Oct. |
Garden, patio, balcony: Belgian and northern French climate, earlier farther south. Estimates to adjust with your own dates.
Frequently asked questions
Green onion in hydroponics: what pH?
No specific range is published for this crop in the Oklahoma State table: we do not force an unverified figure. Start from the common range of 5.5–7.0 and write down your results.
Green onion in hydroponics: what EC?
Oklahoma State has published no value for this crop. Start low, watch the growth and record your measurements in a log.
Green onion: which hydroponic system?
Best suited: the vertical tower, NFT and the Kratky method. Tower, NFT or Kratky.
Green onion: when to sow in Belgium?
Indicative window for a garden, patio or balcony in Belgium or northern France: March, April, May, June, July, and August. Adjust with your own dates.
- Mon Potager Hydroponique growing benchmarks