No. Guinea Pigs cannot eat beet greens. What you should give your Guinea Pig is some lettuce, or peppers. Or even carrots. We asked people and friends about their Guinea Pigs and they said those 3 veggies were the best. Guinea Pigs aren't a big fan on fruits. So mostly stick with veggies.
Guinea Pigs eat a variety of fruits, vegetables, and grasses. Their diet mostly consists of hay, but they also eat carrots, lettuce, apples, and all sorts of fruits and veggies. Guinea Pigs can not eat iceberg lettuce or broccoli though. Also any cooked or fried foods are not good for guinea pigs.
Guinea pigs can eat a lot f veggies and fruits. Some examples are: carrot apple parsley celery cucember grass dandilion clover tomato corn lettuce(in small amounts) basil These are only some foods they like and eat.