Organic seeds (open-pollinated) are the traditional varieties which have been grown and selected for their desirable traits for millennia. 
Open pollinated varieties are pollinated naturally by insects, wind, and birds. Upon harvest of fruit or flowers, open-pollinated varieties will produce offspring which is true to type of the parent plant.
Heirloom seeds have better flavor, are hardier and have more flexibility than hybrid varieties. I have found there is often a difference between organic and non-organic (hybrid seeds) in terms of size and health. I have never found a non-organic seed to be larger than the same seed produced organically.
Organic seeds tend to be cleaner. There is less chaff and dust because it’s a premium seed. Chaff and dust make for diseases.
Hybrid seed, specifically F-1 hybrids, are produced by crossing two open-pollinated varieties. You generally cannot expect satisfactory results saving seed from hybrids.
F1 hybrids refers to the first generation of offspring plants produced by a cross of two or more genetically different varieties of plants. F1′s are bred for vigor, homogeneity, and resistance to disease. However, seed saved from F1 hybrids are unpredictable (not growing true to type) and sometimes sterile.
Hybrid seeds cannot be saved from year to year; you have to keep buying new ones. It is also true that hybrids don’t taste very good because flavor have been sacrificed for qualities and long shelf life.
Hybrids have been bred with an emphasis on yield at the expense of hardiness and resistance. Breeders will sacrifice disease resistance where pesticides are available.
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Yours truly for a great garden with outstanding berries, veggies and flowers.
Polly, Organic Gardener
