The salt used for roads and sidewalks, when sprayed onto a Boxwood shrub has a drastic impact on the foliage. It will insulate the soil and maintain soil temperature to safe levels.īoxwoods planted near sidewalks and roads are most affected by salt damage. This can be prevented by adding a mulch layer. Winter damage can also be caused when the leaves lose moisture, but the plant is not able to replenish its water reserves because the soil is too cold. This sort of winter injury can easily be identified by observing the foliage and noticing that the foliage beneath the snow line is still green and healthy, and only the outer foliage is affected. The foliage is injured when the plant tissue heats up too quickly in the sun. The signs of winter damage start appearing on the outer foliage when the snow melts away. Tolerating such low temperatures is not a common plant trait and Boxwoods are unique for maintaining their green foliage year-round.īut these plants can still suffer winter injury when they are exposed to direct sun in cold weather. They can tolerate freezing temperatures down to -10☏(-23☌). Never let infected foliage fall to the ground or compost it.Ī fungicidal spray containing chlorothalonil will prove helpful if you spray regularly every one or two weeks in the growing season.īoxwoods are winter hardy plants can be grown outdoors all year round in USDA Hardiness zones as cools as zone 4-5. If you are able to identify blight in its early stages, remove the infected foliage right away and dispose of it by sealing it in a plastic bag. To use the soil again, you must get rid of blight in the soil first. If a new plant is planted in the place of a diseased one, the new plant will most likely contract the disease present in the soil. But spores can stay active in the soil for up to 5 years! Blight is promoted in warm and humid conditions. The disease is typically spread from plant to plant in nurseries. A lab test will be able to help you identify whether it’s actually blight or not. If not diagnosed earlier, the end symptoms of Boxwood blight look just like winter injury or drought stress and you will not have much success identifying the problem. Soon after, considerable chunks of the foliage start turning brown, or bronze, and the dried leaves fall off the plant. These spots are accompanied by black streaks on the stems. The first symptoms of blight are brown spots with dark brown edges on the foliage. Join our Facebook Group About Houseplants and Gardening
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