Black Walnut Tolerant: Yes
Deer Resistant: Yes
Rabbit Resistant: Yes
With its spiky foliage, deer generally leave this plant alone; however, during times of food scarcity, they will browse this species.
Junipers are generally free of pests and diseases. When sited properly there are rarely issues with Mountbatten Juniper. Usually, any issues are the result of poor drainage, mechanical damage from people and animals, and/or lack of sunlight.
Rusts (Gymnosporangium) are the most significant fungal disease of Juniper. Juniper is an alternate host for the fungus, which completes the other half of its cycle on plants in the Rosaceae family such as Serviceberry, Apples, Hawthorns, and Pears. The damage on Junipers is a few weird-looking galls and some twig dieback that can be pruned out. The damage is more significant on the alternate hosts previously mentioned and can cause ugly foliage damage or weird growths.
Don’t write off Juniper though! Most references to rust management recommend avoiding the planting of Junipers near hosts within one to three miles. This is sensible to a point-if the fungus needs two plants to grow on, take out the common denominator of Juniper. That said, unless you live on a huge lot (think 500+ acres) AND you’re planting apple/hawthorn/pear in the center of that lot AND you’re positive that there are no Junipers nearby, rust will likely occur at some point. Thankfully, the damage on both host plants is usually minor. Should you plant a Juniper right next to your susceptible plant? Probably not. If you’re planting them on opposite sides of the house or one in the backyard and one by the driveway, you’re likely not going to have an issue.
Aside from Rusts, Junipers can also be affected by issues related to poor airflow or constantly soggy soil. Phomopsis Tip Blight, Kabatina Tip Blight, and Abiotic Tip Blight can brown the tips of the trees in early spring or late winter and can progress inward if left unchecked. These diseases are caused by stress on the plant and are usually comorbid with overhead irrigation/sprinkler systems. Pruning the affected branches in winter and treating the plant with a fungicidal spray in spring can help, but you have to increase airflow and reduce the moisture on foliage to prevent the disease from persisting. Kabatina blight differs in that it needs an open wound to spread; therefore, pruning should be done in winter to prevent spores from moving within the plant.