Alliant Energy is encouraging residents to promote resource conservation by planting trees this fall. Allaints Nancy Craig says in the Operation ReLeaf campaign offers three-thousand landscaping trees to residents for as low as $25. She says planting trees is an appealing and cost-efficient way to reduce home heating and cooling costs. Craig says order forms are available on Alliant Energys website or by calling the DNR at 515-281-6749.