its a rose of sharon i should know i'm sharon,..lol and i have many of them even traded some to snoopy,... btw snoop these are the colors you got,.. when they start to bloom,..
i have many 2-3ft high babies here at my place this past few years,.. not sure why but their here,.. just let it go and nature will take care of it,.. if really dry you can water it but just leave it by its self and it will be fine they can go aver a 100 years if insects don't get it,..
heck i even had one growing on my lawnmower deck???? it was 6 inches tall before i noticed it,..lol