They all don't need to stay alive. They just need some of them to take hold and grow and then spread seeds so that new trees grow, like a normal forest. The id

They all don't need to stay alive. They just need some of them to take hold and grow and then spread seeds so that new trees grow, like a normal forest. The idea is to plant 350 million knowing that a lot won't survive, but that in planting a huge amount, many millions will survive and nature can take over.