Garlic is one of the few plants that doesn't produce seeds. Man has inbred it so long for domestic use that there is no wild form and the plant does not produce seeds (asexual reproduction only), which means that you have to wait around for a loooong time for beneficial mutations to show up.
That being said, work in Japan and Israel has resulted in some garlic setting seed (a little at first) so that now researchers have some seed producing strains which will enable them to increase genetic diversity via crossing different strains (sexual reproduction).
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