The Best Potato Soup

Name: The Best Potato Soup
Cuisine: American
Ingredients: 1 large onion (diced); 1/2 cup thinly sliced carrots; 1 lb bacon chopped; 2 stalks celery (diced); 3 cloves garlic minced; 8 potatoes peeled and cubed; 4 cups chicken broth or enough to cover potatoes; 3 Tablespoons butter; 3 Tablespoons flour; 1 cup heavy cream or half and half; 1 Teaspoon dried tarragon; 1/3 cup kale (can use frozen thawed Kale as well, stems remove and chopped fine); Salt and pepper to taste