Seeds have been classified into two general groups: orthodox and recalcitrant (non-orthodox).The first group, orthodox seeds, probably got their name because these seeds behave very much like the seeds that have been collected and stored for thousands of years. After collection, they can be dried and stored for a long time. This group makes up 80% of all seeds.The second group of seeds have been researched more recently and have become known as recalcitrant (having an obstinately uncooperative attitude). In the early days these seeds seemed impossible to germinate, but now we know that they die when they dry out or are stored too cold.
NSTL
