The ham adds a great deal of seasoning and salt to the entire dish. If desired, you may wait to add salt after the Hoppin' John has cooked for the initial 3 hours, then adjust to your taste.
To add rice and collards to the pot: After cooking the Hoppin' John, add 2 cups cooked long grain rice and 1 (16-oz) package frozen chopped collard greens cooked per the package directions. Mix both in at the end of cooking just before serving. Season only lightly with salt when preparing both.