Water an established juniper only if the plant looks dry. Use a commercial spray, as homemade sprays made with liquid dish detergent are often too harsh and may damage the plant. Juniper is a drought-tolerant plant that will be damaged or suffer from rot in overly wet soil. Limit pruning to the tips of the plant or thin lightly to keep the plant neat. Prune junipers annually to correct their shape. Feed juniper in early spring, using a dry fertilizer with an NPK ratio of 12-4-8. How to trim a large juniper bush? In the springtime, it’s easier to see the general shape of the tree and cut the branches without having to worry about accidentally harming new growth. Soak the soil to a depth of 6 to 8 inches to saturate the root zone, and then don't water again until the top 1 inch of soil feels dry. "Blue Star" juniper is a slow-growing, spreading plant that reaches heights of 2 to 3 feet, with a spread of 3 to 4 feet. Second time in summer and last time in autumn. Spray the plant thoroughly and repeat every four to seven days, as the spray kills only on contact and has no residual effect. It is extremely slow growing, so should behave nicely where it is planted. First, give it … The dramatic, silvery blue foliage adds interest to rock gardens, borders and mass plantings. After a rainy and wet Spring, you might see some dieback at the stem tips, which can be snipped off with no harm to the plant. One good place to start is the removal of any dead or leafless branches – these can be cut off at the trunk. Large juniper bushes are best cut with an electric pruner. However, the plant rarely requires irrigation. She writes about a variety of topics, with a focus on sustainable, pesticide- and herbicide-free gardening. Spray "Blue Star" juniper with insecticidal soap spray if the plant is bothered by pests such as aphids, scale, spider mites or leaf miners. It is better to prune this ground cover three times a year. "Blue Star" juniper is a hardy plant suitable for growing in U.S. Department of Agriculture plant hardiness zones 4 through 8. 3. However, the plant rarely requires irrigation. Maintenance Pruning. How to Care for Blue Star Juniper 1. It does well in slightly alkaline soil. No pruning is required for Blue Star Juniper. Apply the fertilizer at a rate of 1/2 pound for every 100 square feet of planting space. Don't water during the winter unless the weather is extremely dry. She is an Oregon State University Master Gardener and Master Naturalist and holds a Master of Fine Arts in creative nonfiction writing. The plant is deer-resistant and adapts well to coastal environments. Water a newly planted "Blue Star" juniper regularly during the growing season to promote deep, healthy roots. The blue star juniper does well in a variety of soil types, so long as they are well-drained, but its natural preference is for light, sandy soil. You can also remove any branches that are overlapping or sticking out too far. Like all junipers, "Blue Star" juniper (Juniperus squamata "Blue Star") is a sun-loving, drought-tolerant plant that thrives with little maintenance. M.H. The best time to prune your junipers is in the winter or early spring. Remove old, dead growth on the underside of the plant as needed to improve air circulation. Different Ways to Trim a Blue Star Juniper "Blue Star" Growth. When should I prune my Blue Rug Juniper? The first time in the spring before the start of growth. Water a newly planted "Blue Star" juniper regularly during the growing season to promote deep, healthy roots. Their slow growth rate means that Blue Star juniper shrubs hardly ever have to be pruned unless you are trying to fit them into an area with very little room. 2. How to Keep Your Miniature Bougainvillea Alive, How to Care for a Purple Queen Bougainvillea, University of Georgia College of Agricultural and Environmental Sciences: Junipers, University of Minnesota Sustainable Urban Landscape Information Series: Evergreen Trees and Shrubs. © Copyright 2020 Hearst Communications, Inc. While overgrown juniper pruning has its limits, it is possible to trim your plant down to a more manageable shape. Dyer began her writing career as a staff writer at a community newspaper and is now a full-time commercial writer. Water an established juniper only if the plant looks dry. Otherwise, never prune juniper heavily, as old wood doesn't produce new growth.