Popcorn kernels are the seeds of a variety of corn often referred to as "flint corn" due to their naturally harder outer-layer that protects the softer, interior endosperm. The kernels found in microwave bags and prepared for cooking have often been sterilized by the heating and drying process that they go through before being sold. However, some do maintain fertility and will germinate into plants if given the proper conditions.

At certain seed stores you can also buy popcorn kernels that are specifically for planting and growing, not eating. If you want to try and germinate store bought popcorn, you can place the kernels in a damp environment, such as between some wet paper towels, and wait for them to germinate, however keep in mind that many will not germinate due to the preparation process they undergo.