Wasabi (Eutrema japonicum)
Care, watering, light and tips for Wasabi on Floravia.
Quick facts
- Family: Brassicaceae
- Difficulty: Demanding
- Watering: every 3 days
- Light: Partial shade
- Temperature: 10–30 °C
About Wasabi
Eutrema japonicum, commonly known as Japanese Wasabi, is a semi-aquatic perennial plant from the Brassicaceae family, valued for its pungent rhizome. It features large, heart-shaped leaves and small white flowers, thriving in cool, shady environments. It makes an interesting ornamental plant for moist shade gardens or near water features, in addition to its culinary value.
Native range
Japan, Sakhalin Island, and Korean Peninsula
Care tips
It requires indirect light or full shade and cool temperatures (between 8-20°C); direct sun and excessive heat are detrimental. Consistent and abundant watering is essential, keeping the substrate always moist but well-drained, ideally with running or rainwater. The substrate should be rich in organic matter, light, and with excellent drainage, such as an orchid mix or a sandy peat-based soil. A common mistake is allowing the substrate to dry out or exposing it to high temperatures, which can lead to wilting and plant death.
How to save a dying Wasabi
- Warning signs
- Yellowish or brown, wilting or soft leaves. Slow or stunted growth. Rot at the stem base.
- First aid
- Move to shade, ensure high humidity, check drainage. If rot, cut affected parts and repot in fresh substrate.
- What kills it
- Excessive heat (>20°C), low humidity, stagnant water, or direct sun. Needs constant cool, humid environment.
- Can it be saved?
- Yes, if you act fast. It's sensitive but recovers if conditions are corrected immediately. Check roots.