CHICAGO (CBS) — Chicago’s hot, dry weather already has some trees and shrubs showing fall colors at the Morton Arboretum.

WBBM Newsradio’s John Cody reports gardeners can’t water everything, so they have to prioritize: vegetables, prize trees, and shrubs.

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Morton Arboretum horticulturist Sharon Yaizlee said young trees with shallow root systems are particularly vulnerable to high temperatures and low rainfall.

“We see a lot of damage with Japanese maples. They tend to scorch when the weather gets hot and dry, like it is now” she said. “We also see problems with a shrub called serviceberry.”

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Yaizlee said some serviceberry shrubs are already turning brown, or showing signs of fall colors — orange and red shades creeping onto the leaves — even though it’s still officially spring.

“It’s a sign of stress,” she said.

Yaizlee said the Morton Arboretum has recorded 9 inches less rain this year than last.

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She recommended homeowners who want to water their trees use long period trickle irrigation away from the trunk, out under the leaves, to do the most for the trees – consistent with local watering regulations.