Dormant deciduous trees and shrubs may also require extra moisture, especially if they were planted in the past few years.
The consequences of not watering now will show up in spring if precipitation continues to lag. Some evergreens may die; I've already seen several dead arborvitaes. Trees and shrubs may leaf out poorly. Flowering trees and shrubs, such as fruit trees or lilacs, may produce fewer flowers. A general decline may ensue, inviting insect attack.
If a tree or shrub has an earthen dam around its base, fill this several times and let it soak in. You can also set the hose at the base and let it dribble slowly. Also water fall-planted pansies and any perennials growing in containers.
It is nearly impossible to water your entire garden. At this point, I wouldn't worry too much about lawns or most perennials. How much you need to water also depends on your exposure and type of soil. A west or south-facing area will dry out quicker, as does sandy soil.
Take precautions now to safeguard your plants to avoid disappointment this spring.
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