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The Lyle E. Littlefield Ornamentals Trial Garden has served as an excellent choice for testing winter survival of landscape plants. It is located on approximately 5 hectares of land comprising the highest elevation and windiest site on Marsh Island. The site is in USDA hardiness zone 4a. The soil is highly variable, ranging from a fine sandy loam to marine clay, with many stones throughout. In general, most plants are cultivated in beds mulched with mixed soft wood bark from a local mill. Plants receive supplemental irrigation during the first two seasons after planting, and thereafter irrigation is supplied only during periods of severe drought. Pest control is primarily nonchemical in nature. No plants have been given winter protection other than mulch.
Maine Agricultural and Forest Experiment Station
Cappiello. P.E., and L.E. Littlefied. 1994. Woody landscape plant cold-hardiness ratings. Maine Agricultural and Forest Experiment Station Technical Bulletin 156.