I have a pair of box topiary at my south facing exposed front door. Q. Dying Topiary ... ago. The top of the topiary may be dead (die back). If it is dry brown and not green it is probably dead. If your plant isnât over-watered but youâre still wondering why rosemary has brown tips, look to recent changes in lighting conditions. When there are whole brown leaves on a plant, this can indicate several dozen problems; but when just the sides or tips of the leaf turn brown, there is only one problem â the plant is stressed. Folks, if you have leyland cypress trees, then you've probably noticed that at times, part- or all of the trees- may turn brown. Terracotta pots placed on your Terrace or Patio look fabulous containing carefully clipped box balls and topiary triangles. Firstly lets have a look at the problem from a web site on the net: These can occur on the stem from the soil line to the shoot tips. Potted Rosemary Turning Brown. Exposure to cold winter winds, dry conditions and frost contributes to boxwood leaves turning brown, reddish-brown, orange or yellow. hi all. I have tried insecticide and fungicide to control the problem. I have feed and pruned them each spring. Why is the tree turning brown? the other is. Two of my dwarf Alberta spruce has a problem that causes the needles to turn brown and fall off. Iâm not sure what I have done wrong, and would love some advice on how to care for them back to full recovery. There are several reasons why this may happen. Box Blight . they have been there since April but one of them is getting patchy brown leaves. Black, elongated, streaking lesions may also be visible on the stem. The same watering policy for outdoor plants should hold for potted rosemary â it should never be left in a saucer of water or the soil allowed to remain wet. Box plant leaves will go a coppery brown colour if the plant is short of nutrients, or if it is exposed to very cold winds, or to prolonged frosty weather. Before you can take any steps to fix the problem, you need to figure out why your tree is turning brown. Actually, there are numerous reasons why an evergreen might start turning brown. This process, known as bronzing, does not cause permanent damage to boxwood shrubs. Scape the trunk on the top with your fingernail. The same plants have been used for topiary as well. Cut the trunk at this part or the die back will continue down the trunk and kill the plant completely. Junipers (Juniperus spp.) They have survived extremely cold winters. You will have to Test the trunk with your nail till you get to a green part. Then a disease appeared which has caused great problems for both nurseries and home gardeners. are needle-leaved evergreens that are used in many landscapes. There are a number of diseases that could be the culprit; there could also be a problem due to a lack of nutrition in the soil. I recently noticed some brown limbs and looks like dying. My Juniper Needles Are Turning Brown & Falling Off. Most commonly brown leaf tips or brown edges on leaves are caused by the plant not getting enough water. These spots eventually grow larger and coalesce before turning brown or straw-like and dropping to the ground. In fact, winter becomes the most common season for spotting brown foliage on otherwise green boxwood shrubs. Brown leaves on Box plants, How to treat Box Blight Beautiful Box Trees. Boxwood (Buxus) are wonderful evergreen plants to formalize the edge of a border with a low hedge or grown into a larger shrub to make topiary shapes.