So I'm not riding Piper atm. Long story but basically because the lady who gave her to me has asked me not to.
Anyways I tack Piper up and take her for walks along the road and often stand on the verge with her where she grazes different shrubs, plants etc that aren't plentiful in the paddock. Kind of like self selection of medicinal herbs.
I think I heard somewhere that you should never let your horse eat while tacked up/bitted but am not sure if it applies to us? We met this handsome fellow on our last walk.