Place the split peas, ham, onion, carrots, garlic, rosemary, thyme, chicken broth and water in a 4- or 5-quart slow cooker.
Cover the slow cooker, and cook on low for 8 to 10 hours, until the peas are tender. Editor's Tip: As the soup slow-cooks, stir it a few times to evenly distribute the ingredients and avoid any sticking or clumping inside the cooker insert.