Cherry Laurel (Prunus laurocerasus) is a popular evergreen shrub, prized for its glossy foliage, fast growth, and ability to form dense hedges or privacy screens. The presence of white-tailed deer is a major concern for many gardeners, as they can quickly destroy ornamental plantings. This article examines the defense mechanisms of the Cherry Laurel and offers guidance on its classification of resistance to browsing.
General Classification of Resistance
Horticultural resources classify the Cherry Laurel as a deer-resistant plant, often listed as “rarely damaged” or “moderately resistant.” This designation indicates that deer avoid browsing on the shrub when more palatable food sources are available. While no plant is truly deer-proof, its foliage is usually one of the last options a deer will consume. This natural avoidance makes it a reliable choice for gardeners in areas with moderate deer populations.
Plant Defenses and Toxicity
The primary reason for the Cherry Laurel’s resistance lies in its chemical defense system. All parts of the plant, including the leaves and seeds, contain cyanogenic glycosides, such as prunasin and amygdalin. When the foliage is chewed, these compounds combine with an enzyme, resulting in the release of hydrogen cyanide (prussic acid).
This chemical reaction gives the leaves a distinctly bitter taste, which is immediately unappealing to deer and other herbivores. The resulting mild toxicity serves as a deterrent, conditioning the animal to avoid the plant after an initial taste.
When Deer Ignore the Warning Signs
Despite the strong chemical deterrents, deer will browse on Cherry Laurels under specific circumstances. The primary cause is extreme hunger, particularly during harsh winter months or periods of severe drought when natural food is scarce. Increased deer population density can also lead to broader feeding habits as competition for preferred food increases. Young plants are particularly vulnerable because their new, tender growth is often less bitter and easier to chew than the tough leaves of a mature shrub.
Protecting Cherry Laurels From Browsing
For gardeners experiencing browsing despite the plant’s general resistance, proactive protection is necessary. One of the most effective strategies involves the use of physical barriers, especially for young or newly planted shrubs. Simple wire mesh cages or fencing can be installed around individual plants to prevent deer from reaching the foliage.
Another approach is the consistent application of deer repellents, which utilize both scent-based and taste-based formulas. Taste repellents work by making the foliage unappetizing, while scent repellents aim to mask the plant’s odor or introduce a smell deer naturally avoid. For long-term effectiveness, it is necessary to rotate between different types of repellents, as deer can become accustomed to a single product over time.