Asters add vibrant color to gardens from late summer into fall. A common concern for gardeners is whether these perennials are susceptible to deer browsing.
Do Deer Eat Aster?
Asters are generally considered deer-resistant plants. Their texture or taste is often unpalatable to deer. For instance, New England asters (Symphyotrichum novae-angliae) have a tough texture and limited nutritional value, making them less appealing. Rutgers University rates asters with a “B” on their deer resistance scale, indicating they are seldom severely damaged.
While asters are not a preferred food, “deer-resistant” does not equate to “deer-proof.” If other, more desirable food sources are scarce, deer may browse on asters. This behavior is particularly noticeable in late summer and fall when natural forage dwindles.
Factors Influencing Deer Grazing on Aster
Deer are opportunistic feeders, and several factors influence whether they browse on asters despite their general resistance. Food availability plays a significant role; if preferred plants are scarce due to drought, harsh winter conditions, or high deer populations, asters may become a more appealing option.
Specific aster varieties can also exhibit varying levels of resistance. For example, Aromatic Aster (Symphyotrichum oblongifolium) is noted for its pungent foliage, making it particularly resistant. New England asters are generally avoided, but deer may browse their flowers if other food is unavailable. Younger, tender growth on any plant, including asters, can be more appealing to deer than established foliage.
Protecting Asters From Deer
Gardeners can employ several strategies to protect asters from deer browsing. Physical barriers offer a direct and effective deterrent. Fencing is a reliable method, with deer fences ideally being at least 8 feet tall, as deer can jump considerable heights. Polypropylene mesh or metal wire fencing can be attached to stakes to create a barrier, which can be temporary or semi-permanent. Ensuring no gaps exist between the fence and the ground is important, as deer may try to push underneath.
Repellents provide another layer of protection by making plants unappealing through scent or taste. Commercial repellents, such as those with a rotten egg smell, can deter deer, though they often require reapplication after rain or every few weeks. Homemade options can include mixtures with ingredients like rotten eggs, garlic, hot pepper, or strong-scented essential oils like peppermint. Hanging bars of strongly scented soap near plants can also deter deer.
Strategic planting can also help safeguard asters. Placing them closer to the house or in high-traffic areas where human activity is frequent can make deer less likely to approach. Companion planting with highly deer-resistant plants, such as lavender, marigolds, yarrow, or ornamental grasses, creates a buffer zone. These plants, often with strong smells or fuzzy textures, deter deer. Regular vigilance is also important; inspecting plants for signs of browsing allows for timely intervention.