Hey /out/, not sure if on right board but I am moving to a new house soon and my backyard is 100 feet wide.

I was thinking of putting in a garden box the entire width of backyard (100 feet), is this a stupid idea?

If not, what should I put in the box? I was thinking of doing all of just 1 flower (lavender for example), or doing a bunch of vegetables.

Never gardened before so dont know anything.

(Pic is not my backyard)