There is more than one method to kill the insects and mold living in pinecones but I have always used the oven rather than the chlorine bleach or vinegar methods.
|Single layer on cookie sheets in oven|
We're collecting for newly planted beds at a local school plus tiny ones for holiday table decorations.
We constantly pull pine tree seedlings from our flower beds but if you want to grow trees from the pinecones you collect, there's a YouTube video for that. Read the comments section, too, where others give more tips on their methods.
You could also make these cute sprouted pine cone bonsai for your holiday table.
Put the bottom of a lime-Sulphur-treated pinecone in a cute container filled with soil and keep it moist.
If I had any crafty ability at all I'd make these cute people!
We have lots of pine cones if you want some.