As I've posted elsewhere (mostly in the tomato forum), I've a container box (~0.78 cubic feet) with a tomato plant coming out of it

Living in Sunny San Diego, can I keep this guy going throughout the year? (I know that it does get to 50 degrees F every once in a while

If I can avoid replanting every year, then how can I replenish the nutrients in the soil?
Grace and peace,
Michael