Fresh citrus peels may produce a noticeable aroma for a short period, while citrus-scented products can provide a stronger fragrance.
The problem is durability.
Outdoor odors disappear quickly because of sunlight, wind, rain, and temperature changes. A smell that seems strong on the first day may be barely noticeable a few days later.
Citrus can therefore be considered a low-cost experiment, but it should not be the foundation of a snake-control plan.
10. Eucalyptus
Eucalyptus has a powerful aromatic profile and is commonly used in household and personal-care products.
Because snakes rely heavily on chemical cues as they explore their environment, strong odors are often assumed to be especially unpleasant to them.
That does not mean eucalyptus is a proven snake barrier.
If using eucalyptus oil, remember that concentrated essential oils can pose risks to pets and should not be applied directly to animals or used carelessly around enclosed living spaces.