Interesting words: Mint

As it’s now the time when many people go to see the cherry blossom at the Osaka Mint, here are some related words:
Mint is a place where money is made. So, we sometimes use the word relating “lots of money” such as in “That will cost you a mint”, or “He is really minted” (rich). Another usage is “mint condition”, meaning a secondhand item that is in perfect condition, like new… like a newly minted coin. For example: “For sale – mint condition 1959 Gibson Les Paul Goldtop guitar”.
I can’t find any connection to the herb called mint. The two words seem to have separate origins.