I didn't plant it. I always thought it was Salvia and your salvia leaves are the first leaf I've seen that finally really matches it. But good to know though...
Looking closer your leaves are frosted. I made another mistake. 😜
There are several different Nepeta cultivars that look similar but one guess for yours is Nepeta x faassenii 'Walker's Low'. It is a cultivar that's been around and popular for a fairly long time, introduced in 1988.