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Are golden trowels even used for anything ? If not, Why do we get them every time we harvest crops ?
We just do, no reason.
wish we could just sell them ive got thousands of the things
The golden trowels are used to unlock the sections of the Hanging Gardens farm, you will keep getting them forever, even after you've unlocked all the sections on Hanging Gardens. Hanging Gardens is several years old, so if you don't have that farm, I think you can write to support and ask them to add it to your farm.
I apparently can't put a link here, but if you go to the Farmville blog and search, the blog post on Hanging Gardens is dated April 2013.
I thought the original post was asking why do we still get them after finishing the Hanging Garden farm, but after I re-reading it I realize that might not be the case. The Hanging Garden farm should be on the travel menu between Atlantis and Australia if you sort by order of release. You can use the trowels to uncover the treasures and eventually earn the Unwither Fountain. You have to finish each level before you can start the next. Good luck!
AgentOrange -- I think we can only post Zynga support links.
I have a ton of them if they ever expand. LOL