Slow Cooker Minestrone Soup

Name: Slow Cooker Minestrone Soup
Cuisine: Italian
Ingredients: 8 cups water; 1 cup dried great northern beans, rinsed; 1 medium yellow onion, chopped; 2 medium carrots, chopped; 2 medium ribs of celery, chopped; 1 pound roma tomatoes, chopped; 3 medium garlic cloves, chopped; 1 tsp dried oregano; 1/2 tsp dried rosemary; 1/4 tsp crushed red pepper flakes; 2 dried bay leaves; salt & freshly ground black pepper; 8 ounces uncooked ditalini pasta; 5 ounces fresh baby spinach leaves, chopped; 1 zucchini, chopped; 1 TBSP fresh lemon juice; freshly grated Parmesan cheese for serving