Mandevilla plants are popular ornamental vines, known for their beautiful, trumpet-shaped flowers and vigorous climbing habit. Also called rocktrumpet, they add lush greenery and vibrant blooms to gardens. A common question for gardeners is their susceptibility to browsing by local wildlife, particularly deer.
Mandevilla and Deer Behavior
Mandevilla is generally considered deer-resistant. This resistance stems from the plant’s natural defenses, primarily a milky sap within its stems and leaves. The sap contains glycosides, which contribute to a bitter taste and mild toxicity. Ingesting these compounds can lead to an upset stomach, nausea, and vomiting in animals.
Despite this, no plant is entirely deer-proof. Deer may still browse Mandevilla if preferred food sources are scarce, such as during drought or harsh winter conditions. Young, newly planted Mandevilla may be more vulnerable, as deer are often attracted to tender, fresh growth. While Mandevilla is not typically a deer’s first choice, careful consideration remains beneficial in gardens with active deer populations.
Protecting Mandevilla from Deer
To protect Mandevilla from deer, gardeners can implement several measures.
Physical barriers prevent deer access. Fencing, at least 8 feet tall, deters deer, as they are capable jumpers. Netting or wire cages can also protect individual plants, especially during vulnerable young stages.
Deer repellents make plants unappealing. Commercial sprays often contain ingredients with unpleasant odors or tastes, such as putrescent egg solids or garlic. Homemade solutions, like mixtures of eggs, water, and dish soap, can be applied to foliage. Regular reapplication, particularly after rain, is necessary for effectiveness.
Strategic planting also deters deer. Placing Mandevilla close to the house or in high-traffic areas reduces browsing due to human activity. Companion planting with highly deer-resistant plants that have strong scents or bitter tastes, such as lavender, rosemary, or sage, creates a natural barrier. Combining these methods often yields the most successful outcome.
Post-Deer Damage Care
If Mandevilla plants experience deer browsing, they often recover well. First, assess the damage; minor nibbling on a few leaves allows the plant to recover. For significant damage, prune chewed or broken stems back to the nearest healthy growth point. Use clean, sharp pruning tools for proper healing.
This pruning encourages new growth, promoting a fuller, healthier shape. Mandevilla’s fast growth rate aids its ability to bounce back. Ensuring adequate water and balanced nutrients through fertilization further supports recuperation and vigor.