Alfalfa is probably the most popular, but if other types of roughage are more readily available and comparable in quality, by all means use what works best for you. Mixed grasses, clover, and cereal grain plants are excellent alternatives. Of course, any vegetation harvested while plants are young makes the best feed, and all hay should be closely monitored for freshness. Watch for mold or contamination by rodents, cats, or bird droppings. During the growing season, your garden can be an excellent source of roughage. Plants that are no longer producing or are in overabundance, including veggies such as melons, pumpkins, squash, greens, and carrots and their tops, make great roughage. Just be sure they are fresh and clean.