They do grow out of the ground.
I'd like to personally thank the sweaty, bug bitten indigenous Brazilian laborers, who despite having already lost both hearing and and a few fingers, harvested the particular goncalo-alves tree with no regard to the diverse animal life living in its canopy, just so it could be cut into timber in order for Warmoth to make it into a neck for me. Good job, Kudos!
Similarly, I'd like to thank the no less sweaty, mineral encrusted Chilean miners, who despite toxic levels of copper in their bodies, continued to mine the red metal, so that it could be made into the wire for my pickups. Once again, good job!
Thanks to Nobel corporation for taking on countless ship loads of rotting wood pulp from the global market, soaking it in red fuming nitric (and some sulfuric acid to mitigate water production in the reaction), in order to create the nitrocellulose used in the finish of my neck.
And lastly, very honorable mentions!
First to the people of China, who are adept at taking the best of metallurgical processes developed by others, applying it to genuine Chinese iron ore in a way that is sub-marginally satisfactory, and selling it cut rate prices on the world market. Helps keep prices down, and quality from becoming too high!
And second, an honorable mention to the great men and women of the United States of America, who have become the worlds number one producer of petrochemicals, and through which have made the great poly finish on the guitar body an amazing feat.
So, through sweat and blood, along with human and ecological destruction, it all grew out of the ground!