The Mock Orange shrub (Philadelphus genus) is a popular garden choice known for its highly fragrant, white blossoms that appear in late spring to early summer. These deciduous shrubs offer an attractive focal point in the landscape, often with a scent reminiscent of orange blossoms. Gardeners frequently seek to determine if this appealing plant will become a target for local deer populations.
Mock Orange Palatability and Classification
Mock Orange is generally classified as a deer-resistant shrub, meaning it is not a preferred food source. This classification stems from the plant’s physical and chemical properties, which make it less palatable than many other landscape options. The foliage has a bitter taste, which deer typically avoid when more appealing options are available. The leaves and stems possess a woody texture that is less desirable than tender growth.
Formal assessments, such as those conducted by Rutgers University, rate the plant as “Seldom Severely Damaged.” This indicates deer will usually leave it alone, which is significant for gardeners in areas with high deer presence. Since Mock Orange is deciduous, it sheds its leaves in the late fall, offering no foliage during the winter months when food is scarcest. Mature shrubs usually survive in deer-populated environments without constant protection.
Environmental Factors that Override Deer Resistance
Despite the general classification of deer resistance, no plant is truly “deer-proof,” and specific environmental pressures can cause deer to browse Mock Orange. Severe food scarcity is one common factor, particularly during prolonged, harsh winters. When snow cover is deep and other food sources are depleted, deer resort to desperation feeding, consuming plants they would normally ignore. This behavior often involves eating the woody stems and branches of resistant shrubs.
A high local population density of deer also increases the likelihood of damage to less-preferred plants. Competition for limited resources means the Mock Orange’s bitter taste may be overlooked by a hungry animal. Newly planted shrubs are especially vulnerable because their growth is typically more tender and palatable than mature plants. Young shoots in the spring also present a temptation, as they are nutrient-rich and softer than older foliage.
Practical Strategies for Plant Protection
For gardeners whose Mock Orange shrubs are being targeted, implementing physical barriers provides the most reliable protection.
Physical Barriers
An eight-foot-tall woven wire fence is the most effective permanent solution, as deer are capable of jumping lower barriers. Temporary fencing or cages made of wire mesh can be placed around individual shrubs, especially during the winter when feeding pressure is highest. Gardeners can also use netting draped over the shrub to prevent direct access to the foliage and stems.
Chemical Deterrents
Chemical deterrents offer another layer of defense, working by taste or scent to discourage browsing. Products containing putrescent egg solids create a foul smell and bitter taste that is off-putting to deer. These repellents must be applied directly to the foliage and reapplied regularly, especially after rain or new growth. To maintain effectiveness, it is important to rotate between two or three different deterrent products throughout the season, as deer can quickly become accustomed to a single scent or taste.