Timely watering helps trees stay strong before winter arrives
By Andy Anderson
As autumn paints the landscape with colour, it is easy to assume trees are ready to rest. However, when fall brings dry weather instead of steady rain, trees can enter winter already stressed. Fall droughts may seem harmless, but their effects can last well into the next growing season.
Even after leaves fall, tree roots remain active late into autumn. This is the crucial time for trees to absorb and store water before the ground freezes. Without enough moisture, trees risk root damage, reduced cold resistance, and greater vulnerability to pests and disease.
Young trees, recently planted ones, and shallow-rooted species like maples and birches are especially sensitive to dry conditions. Evergreens are also at risk, as they continue to lose moisture through their needles during winter.
To keep trees healthy, watering in fall should focus on depth rather than frequency. Deep soaking encourages strong root growth. The goal is to moisten the soil 8 to 12 inches beneath the canopy. Soaker hoses or slow-running garden hoses work best. Water when the soil is dry 4 to 6 inches below the surface, the air is above 40°F, and the ground is not frozen.
Adding a 2 to 4-inch layer of mulch around the tree helps conserve moisture, reduce competition from grass, and protect roots from temperature swings. Keep mulch a few inches from the trunk to prevent rot.
Avoid using fertilizer in fall, as it can promote tender new growth vulnerable to frost. Instead, focus on water and root health. Watch for drought stress signs like early colour change, browning leaves, or needle loss in evergreens.
By prioritizing watering and mulching during dry autumns, trees—especially young ones—can enter winter strong and emerge vibrant in spring. Consistent care now ensures a healthier landscape later.
Photo Credit: gettyimages-zms
Categories: Illinois, Weather