Seeds

Each different type of seed has a process and a time-need to germinate.

Before the seeds appeared, the plants reproduce by spores. In the plant realm, the plants evolve from the ferns and liverworts and create a new plant family; the conifers. They reproduced by pine seeds that need a long process to open and allow the seeds that are kept inside to germinate. In the life cycle of the conifers the fire is needed to open the pine nuts.

When the insects appeared in Earth, the plants evolve and allowed to create a new plant family, the flowering plants. They depend on the insects for pollination. Their seeds were much lighter that the conifers' seeds. Dependindg on each plant the period for germination will be longer or shorter.

The ash for instance would need 18 months of cold and heat to be able to germinate.

The willow seeds can stand a shallow dormancy period.