Seeds require certain conditions in which to kick-start germination. We live in a warm climate, therefore, most indigenous seeds require exposure to heat before germination can occur, whereas some exotic seeds from colder climates require exposure to extreme cold.
Growing from seed is simple, if you know the natural habitat from which the seed came and mimic this environment to encourage germination.
Below is a list of Bonsai species and the care that they need in order to germinate-