It is a fine powder applied to the seeds at time of planting.  Inoculant is living bacteria that enables garden bean and pea plants to produce nitrogen fixing nodules along the roots which act to gather nitrogen (which is vital for plant growth) from the air and soil resulting in better growth and production.  In addition, the nitrogen gathered stays in the soil at the end of the season for the next season’s crops to profit from.

NOTE: Store it in a cool place.   It is best to use inoculant in the year it was purchased.  Excess inoculant can be worked into the soil.