Inoculants contain microorganisms and should be stored under cool conditions. Room temperature is acceptable for most, although refrigeration is probably most suitable for inoculants intended for use with temperate legumes . Some inoculants are provided as frozen concentrates and should be stored in this condition. If the packet is opened but not completely used, make sure that it is resealed in a manner that retains its water content. Dessication will lower cell viability and could result in poor nodulation .
Inoculants come with expiration dates.
Use of the inoculant after this date is not recommended. The University of Minnesota is an equal opportunity educator and employer.