Cilantro vs Vietnamese Coriander for Hydroponic Growing (2026)
Vietnamese coriander never bolts in heat - unlike cilantro which bolts above 27°C - making it a superior choice for warm grow rooms, while cilantro's more neutral flavour has broader culinary appeal in Western markets.
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Cilantro and Vietnamese coriander (Persicaria odorata) both provide coriander-adjacent flavour in the kitchen, but their heat responses are completely different. Cilantro bolts above 27°C, shifting from leaf production to seed production and becoming unusable as a herb. Vietnamese coriander does not bolt at any typical indoor growing temperature, making it the definitive choice for warm rooms or summer growing.
Side-by-Side Comparison
| Feature | Cilantro | Vietnamese Coriander | |---------|----------|---------------------| | Difficulty | Moderate | Easy | | Days to First Harvest | 21–28 | 28–35 | | pH Range | 6.0–7.0 | 5.5–6.5 | | EC Range (mS/cm) | 1.0–1.6 | 1.0–1.8 | | Light (h/day) | 12–14 | 12–14 | | Water Temp (°C) | 15–24 | 18–26 | | Yield per Plant | 15–25 g/plant | 30–50 g/plant | | Key Flavour Profile | Citrus, soapy | Coriander + lemon, more pungent |
Where Cilantro Wins
- Faster first harvest: 21 days minimum vs Vietnamese coriander's 28 days.
- More familiar flavour profile - universal recognition in Mexican, South Asian, and Middle Eastern cuisine.
- Widely available as seed for fresh-start each cycle.
Where Vietnamese Coriander Wins
- Never bolts - provides consistent leaf production year-round regardless of temperature.
- Higher yield per plant (30–50 g vs cilantro's 15–25 g).
- Rated Easy vs Moderate - simpler to manage once cuttings are established.
Growing Them Together
pH ranges overlap at 6.0–6.5 and EC at 1.0–1.6. The temperature window differs slightly: Vietnamese coriander prefers warmer water (18–26°C) while cilantro prefers cooler (15–24°C). A compromise at 20–22°C suits both reasonably well. Note that Vietnamese coriander is typically propagated from cuttings, not seeds - plan accordingly for your seeding schedule.
Which Should You Grow?
- Choose Cilantro if your grow room stays below 24°C and you want the most widely marketable coriander herb.
- Choose Vietnamese Coriander if your space runs warm above 24°C, you want higher per-plant yield, and you can source cuttings for propagation.
- Grow both if you want a coriander-flavoured herb year-round - cilantro for cooler winter cycles, Vietnamese coriander as a permanent summer replacement.