This article claims that there are no GMOs in existence for backyard crops and that Non-GMO labels on seed packs and garden seedlings are nothing but a marketing gimmick since all the plants/seeds for gardeners are non-gmo.
"Never mind that all vegetable seeds have and continue to be non-GMO crops. GMO vegetable seeds do not exist and are not available to backyard gardeners.
There are only eight crops commercially available as GMOs: corn, soybeans, papaya, cotton, squash, canola, alfalfa and sugarbeets. GMO squash isn't available for the backyard gardener — only on a commercial scale.
A pepper plant or seed packet marked non-GMO is labeled as such because you can't grow or buy it any other way."