Slow Cooker Root Veggie Winter Soup

Name: Slow Cooker Root Veggie Winter Soup
Ingredients: 1 (32 ounce) carton low-sodium vegetable broth (such as Imagine™); 1 (10 ounce) can low-sodium chicken broth; 1 1/4 cups water; 1 teaspoon caraway seeds, divided; 1/4 teaspoon dried cilantro, or more to taste; 1 teaspoon dried tarragon; 1/4 teaspoon coriander seeds; 1 1/2 pounds colored carrots, peeled and sliced; 1 pound parsnips, peeled and sliced; 1 large rutabaga, peeled and cubed; 1 large white onion, cut into large wedges; ground white pepper to taste; 1 green onion, chopped