Using salt to prevent roses or any plants from digging under a fence is not a recommended approach. Salt can be harmful to soil health and may damage the plants you are trying to protect, as well as other nearby vegetation. Additionally, salt can lead to long-term soil degradation and negatively affect the ecosystem in your garden.
If you're looking to prevent roses or other plants from digging under a fence, consider alternative methods:
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Physical Barriers: Install a deeper fence or bury the bottom of the fence underground to prevent plants from digging underneath.
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Planting Deterrents: Use plants that are less appealing for digging or create a dense planting area that discourages digging behavior.
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Mulching: Adding a thick layer of mulch can deter plants from digging by making the ground less appealing.
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Repellents: Some natural repellents, such as citrus peels or vinegar, may deter digging.
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Regular Maintenance: Prune and maintain the roses to keep them healthy and minimize any potential digging behavior.
Always consider environmentally friendly approaches to managing your garden and pets.