Why Can't Some Seeds Sprout?

People are eager to see seeds sprout after sowing but some of them will never do so There are many reasons for this-per-haps some of them have been preserved too long some may have been damaged by in hers may not have well de-veloped embryos. Sometimes, even if new and well- developed seeds are sown, they do not sprout immediately. That is be- cause the seeds need a period of dormancy which may be several weeks for some seeds, two or three years for others, or even longer.