A trend in carefully planned super-charged plant growth is gaining interest in the United States as cities and towns battle rising temperatures and climate change.By Emilie LounsberryPRINCETON, N.J.—For years, it’s been just a patch of grass in the middle of a small park. Soon the ground will be a botanical marvel of sorts, tilled and teeming with some 20 varieties of native trees and shrubs jammed together to trigger super-charged growth. 

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