Answer:
Blade to blade I always win My foe laid low and even. Yard by yard through thick and thin I'm busiest in season.
Though not a plant I have leaves. though not a beast I have spine. Though many wouldn't need me I am more valuable than wine.
I stand up tall and am made of steel With baguettes and garlic at my heel. I love the colors red white and blue but obviously not as much as you. I am a marvel for all to see Though to some I am a monstrosity!
I work when I play and play when I work
I can be thin but not fat; in your body but never on your placemat. I'm always better when I'm fresh but you'll never see me in the flesh.
Give it food and it will live, give it water and it will die.