Heirloom: Historically harvested seeds (over decades) that produce roughly identical plants from generation to generation.
Open Pollinated: Seeds are produced by wind or self-pollinated and produce roughly identical plants from generation to generation.
Hybrid: Seeds generated from 2 parent strains targeting specific characteristics; heavy production, disease resistance, hardiness, etc.
GMO: Genetically modified Organism. Genetic engineering inserts genes into another unrelated organism to bring a desired outcome, eg; bacteria introduced into corn to offset the damage of earwigs on the ears of corn.
Organic seed: Any seed produced meeting the USDA standards for Organic growing; does not include GMO’s.