Stop puppy from eating plants in the garden.

My wife and I adopted a 5 month old golden retriever / red setter cross who is a parvo survivor, so she has sensitive tummy. She also really enjoys pulling out dead plants, eating plant stalks/stems, etc from anywhere she can find them – which make her tummy upset.

Unfortunately we don't have access to an enclosed run, so for now we are forced to keep her on leash and monitor her pretty closely around any gardens that we know she is attracted to.

Curious if anyone has any tips? We're practicing "leave it" , but we are still in the early stages of practicing in home with few distractions. We'd like to give her more opportunities to run off leash, but we don't want to risk her gut health either.

Thanks!