Cats and foxes can be a nuisance for gardeners, as they dig up soil and contaminate crops with their waste. Alessandro Vitale, an organic gardener in London, suggests a homemade herbal spray as an effective deterrent. The recipe involves simmering fresh herbs such as basil, geranium, and sage, along with garlic and optional onion, to create a potent solution that overwhelms the animals' sensitive noses. This method not only repels cats and foxes but also masks the scents that attract them. To use the spray, gardeners should apply it around vulnerable areas of their gardens and reapply weekly or after rain. This humane approach allows gardeners to protect their plants without harming the animals.