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Cold hardiness and carbohydrate content of 4 cultivars of field-grown southern magnolia (Magnolia grandiflora L.) were determined monthly during the 1992-1993 winter. Initially, `Claudia Wannamaker', `Little Gem', `Timeless Beauty', and `Victoria' had similar stem and leaf cold hardiness estimates of -6C in October. However, by February `Claudia Wannamaker' and `Victoria' stems were 6 and 3C more cold hardy than `Little Gem' and `Timeless Beauty' stems. `Claudia Wannamaker' leaves were also 6C more cold hardy than `Little Gem' and `Timeless Beauty' leaves in February. Carbohydrate analysis indicates increases in oligosaccharides during cold acclimation in fall.

194 COLD HARDINESS AND CARBOHYDRATE CONTENT OF FOUR CULTIVARS OF FIELD-GROWN SOUTHERN MAGNOLIA