Seed longevity (years) is presented. Find out the wrong one.

Seed longevity is defined as seed viability after seed dry storage and therefore describes the total seed life span. This storability period includes both the dormant and non-dormant states.
Seed longevity of lettuce is 6 years.
Seed longevity of cucumber is 5 years.
Seed longevity of onion is 1 year.
Seed longevity of okra is 2 years.