Some months back I collected more from around the two monkey puzzles in Redwood. Their present state above. They're easy: you push the pointy end into soil, and keep watered and wait. I never tire of sprouting them. The others that I've sprouted continue to grow well outside.
Monkey puzzles are the common name for the tree Araucaria araucana, native to Chile and Argentina.
Found more the other day:
They're found in the leaf litter. People walk over them in the park.