Wasabi is a difficult to grow and this batch had limited growth and the leaves were completely bleached. These symptoms are common with extreme magnesium deficiency and general nutrient depletion.
wasabiwasabi plantmagnesium deficiency
From Summer Gardening in British Columbia
I gave several applications of Epsom salts (magnesium source) and a balanced organic fertilizer. Here they are one week later - coming back to life.
wasabiwasabi plantepsom salt