Bok Choy vs Tatsoi for Hydroponic Growing (2026)
Tatsoi tolerates a lower minimum EC (1.0 mS/cm vs bok choy's 1.5) and matures in 21–35 days at 50–100 g, while bok choy reaches 80–120 g at 25 days - bok choy is the higher-yield crop, tatsoi the lighter-EC option.
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Bok choy and tatsoi are both Brassica rapa variants rated Easy in hydroponics. Bok choy produces larger, more upright heads (80–120 g at 25 days) while tatsoi forms compact rosettes (50–100 g at 21–35 days) with a lower EC minimum. If your system already runs at EC 1.0–1.5, tatsoi is the better fit; if you're running a dedicated Brassica system at EC 1.5–2.5, bok choy delivers higher per-plant biomass.
Side-by-Side Comparison
| Feature | Bok Choy | Tatsoi | |---------|----------|--------| | Difficulty | Easy | Easy | | Days to First Harvest | 25–45 | 21–35 | | pH Range | 6.0–7.0 | 6.0–7.0 | | EC Range (mS/cm) | 1.5–2.5 | 1.0–1.8 | | Light (h/day) | 10–14 | 10–14 | | Water Temp (°C) | 15–22 | 15–22 | | Yield per Plant | 80–120 g at 25 days | 50–100 g baby | | Key Flavour Profile | Mild, crisp | Mild, spoon-shaped, slightly sweet |
Where Bok Choy Wins
- Higher per-plant yield (80–120 g vs tatsoi's maximum 100 g at baby, with bok choy typically larger).
- Wider EC upper range (2.5 vs tatsoi's 1.8) allows richer nutrient solutions for faster growth.
- More recognizable to consumers in Western markets; easier to sell as a whole head.
Where Tatsoi Wins
- Lower EC minimum (1.0 vs bok choy's 1.5) means it works in systems shared with lettuce and herbs.
- Harvestable at 21 days - 4 days faster minimum than bok choy.
- Compact rosette growth form is highly visual and sells well as a baby-leaf premium product.
Growing Them Together
Both share identical pH (6.0–7.0), light (10–14 h), and temperature ranges (15–22°C). EC is the constraint: the overlap is only 1.5–1.8 mS/cm. At EC 1.5, both grow reasonably but bok choy will be on its nutrient floor. For a shared system, run EC at 1.5–1.8 and harvest both as baby greens at 21–25 days - at that point, the EC difference matters less.
Which Should You Grow?
- Choose Bok Choy if your system runs EC at 1.5–2.5 and you want a larger, more commercially recognizable head.
- Choose Tatsoi if your system runs EC at 1.0–1.5 (shared with herbs or lettuce) and you want a baby-rosette crop.
- Grow both if you target a restaurant baby-Brassica mix - seed tatsoi 4 days before bok choy to harvest both at the same time.