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Crop guide Hydroponic garden · hobbyist Français
Komatsuna grown in a hydroponic tower

Leafy greens and brassicas · Easy

Komatsuna

Brassica rapa var. perviridis

Tower or NFT.

EC (mS/cm)
n/a
pH
n/a
Cycle
short
Difficulty
Easy

Sound origin

Brassica rapa var. perviridis

Native to Japan: its name comes from the village of Komatsugawa, in Edogawa (Tokyo), where it was widely grown in the Edo period. The shogun Tokugawa Yoshimune is said to have named it in 1719.

Source: Wikipedia (in English)

What it provides nutrients

Per 100 g, raw · Komatsuna (mustard spinach), raw

22kcalEnergy
92.2gWater
2.8gFiber
2.2gProtein
  • Rich in vitamin C
  • Rich in vitamin B9
  • Source of potassium
  • Source of calcium
Vitamin C 130 mg 163 %
Vitamin B9 (folate) 159 µg 80 %
Calcium 210 mg 26 %
Potassium 449 mg 22 %
Iron 1.5 mg 11 %
Magnesium 11 mg 3 %
Vitamin K n/a
Vitamin A (beta-carotene) n/a

% 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. 168438 (not in the Ciqual table)

Key steps

  • Japanese spinach: tender leaves, mild flavor between cabbage and spinach.
  • Harvest in 4 to 6 weeks, leaf by leaf or the whole plant.
  • More heat-tolerant than spinach.
  • Eaten raw when young, or stir-fried.

In which system?

TowerNFTGrowing mediumKratky

Approximate calendar

SowingMar., Apr., May, Aug., Sept.
Plantsnone
HarvestApr., May, June, Sept., Oct., Nov.

Garden, patio, balcony: Belgian and northern French climate, earlier farther south. Estimates to adjust with your own dates.

Frequently asked questions

Komatsuna 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.

Komatsuna 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.

Komatsuna: which hydroponic system?

Best suited: the vertical tower, NFT and the Kratky method. Tower or NFT.

Komatsuna: when to sow in Belgium?

Indicative window for a garden, patio or balcony in Belgium or northern France: March, April, May, August, and September. Adjust with your own dates.

Sources
  1. Mon Potager Hydroponique growing benchmarks

My trials

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