Fresh wasabi has the shortest shelf life, according to Eat by Date. It will last about a day or two before it turns mushy and it’s time to bid it adieu. Wasabi paste, sold in a tube, per Lucky Belly, can last up to two years past its sell-by date, but only if it is unopened; however, Eat by Date suggests that a year is the maximum life expectancy for an unopened tube of wasabi regardless if it is stored in the pantry or the refrigerator. If your tube of wasabi is opened, then you need to store it in an airtight container in the refrigerator for it to last for 12 months.
The powder, on the other hand, has a much longer shelf life, according to Lucky Belly. They note that it can last in your pantry for three to four years past its expiration date. In contrast, Eat by Date is not as generous with its range. The site shares that wasabi powder also only lasts a year regardless if you store it in your frig or pantry. They also explain that you can generally tell if it’s time to throw your wasabi — paste or powder — in the circular by smelling it and looking for any separation of ingredients, change in color, or mold. These are all indicators it’s time to toss it.