Why do some seeds not germinate?
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Many kinds of seeds have very thick seed coats. These
obviously keep water out of the seed, so the embryo cannot
get the water needed to activate its metabolism and start
growing.
Many plant species invest chemicals in the developing
seeds, and these chemicals inhibit the development of the
embryos. They keep the embryos dormant. Obviously the seed
must have some way to eliminate these chemicals before they
can sprout.
Many temperate zone species that use inhibitors use
abscisic acid. This chemical induces dormancy in the
embryo. The chemical is produced in abundance in the late
summer and early fall. The seeds in the fruits become
dormant so, even if they are dispersed in autumn, they
cannot sprout.
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Micro Biology 
