Non-flowering plants such as ferns and mosses don't need seeds. Instead, they produce spores.
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Pteridophytic plants among vascular and all other non-vascular plants do not have seeds.
The parent plants want the seeds to go away from the parent plants so that their genes don't compete. That is why they will blow around or catch on a animals coat.
By the Wind and the pollen. Because the wind carries the pollen over plants flower and all other things that grow!
Well birds may sometimes carry seeds in their mouths (or beaks) and while their flying they drop seeds which causes plants and trees to grow.
Grafting branches from another tree
1 - it takes a long time for the seed to get ready to open, 2 - but in the right conditions, the roots will split up quicker