Hot Pursuit: Searching for the Optimal Wasabi Greenhouse Growing Environment

Understanding the optimal environmental conditions for wasabi ( Eutrema japonicum ) is key to expanding its cultivation. This study identifies key factors influencing wasabi’s growth, including photosynthetic photon flux ( Q i ), intercellular CO 2 concentration ( C i ), soil moisture, and vapor pressure deficit (VPD). Results show that wasabi thrives with soil moisture ≥95% field capacity, VPD ≤ 2.0 kPa, and light levels between 500 and 830 µmol·m −2 ·s −1 . Maximum net assimilation occurred at 828 µmol·m −2 ·s −1 , with strong responses to increased CO 2 , suggesting greenhouse target CO 2 at 1200 ppm. These findings provide initial soil moisture and VPD thresholds for wasabi cultivation in controlled environments, with further research needed on irrigation practices.