11/23/2020
Water evergreen plants now before the ground freezes!
Although rains have returned in the Northeast and conditions are improved, according to the U. S. Drought Monitor 37% of the Northeast is still under extreme to moderate drought, while 24% is abnormally dry. Prolonged drought conditions cause complex physiological alterations within cells, which appear in the form of long-term symptoms such as dieback of stems or complete plant death, and pest and disease attack. In addition, drought stressed plants are more susceptible to many pests like wood borers, bark beetles, spider mites, lacebugs, and aphids.
Weather is getting cold and it’s time to winterize your clients’ plantings. Drought conditions followed by freezing can cause severe damage to broadleaved or needled evergreen landscape plants, particularly destroying their root system. Roots are less hardy than stems so they are more susceptible to cold injury. Therefore, winter management prior to freezing is very important because plants cannot uptake water from ice. In addition, moist soils hold more heat than dry soils. So, make sure your trees and shrubs have enough water in their root zone before the ground freezes to avoid desiccation or drying of plants. In the case of newly planted trees make sure all cracks in the planting hole are completely filled, because cold air can enter through these voids, thereby reducing root growth or killing the new roots. Avoid pruning the plants and add fertilizer at this point.
Bottom line: water now to reduce damage this winter.
Look for a webinar from your Extension Landscape and Greenhouse team coming this January in which drought, its effects and strategies to mitigate it year-round will be discussed.
Muhammad Shahid
State Specialist, Greenhouse and Nursery Production
Cooperative Extension, University of New Hampshire
Email: [email protected]