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Fig. 1. Rehydration of Fraser fir Christmas trees as affected by storage time following cutting. (A) Fresh weight (percentage of initial fresh weight) immediately before placement in water ( l ); 7 days later ( m ). (B) Xylem pressure potential immediately before placement in water ( l ); 7 days later ( m ). Vertical bars, ±SE. Trunks were not recut when trees were placed in water. To maintain the freshness of cut Christmas trees, it is important to make a fresh cut on the base of the trunk just before displaying the tree in a stand containing water (Ahrens and Stephens, 1975; Chastagner, 1990; Hinesley and Huxster, 1991; Van Wagner, 1963). It is also important to provide adequate water daily in the stand because trees can consume up to 1 liter·day-1 for each 2.5 cm of trunk diameter (Chastagner, 1990). For most Christmas tree species, it has not been determined how much time can elapse after the trunk is cut before rehydration capacity decreases. Fresh Douglas fir [Pseudotsugu mensiezii (Mirb.) Franco] Christmas trees can dry 24 to 48 h before rehydration capacity is noticeably reduced (Chastagner, 1990). Our objective was to examine the rehydration capacity of Fraser fir [Abies fraseri (Pursh) Poir.] Christmas trees, as affected by time since cutting. Thirty-two Fraser fir Christmas trees were selected at the Mountain Research Station, Waynesville, N.C. Trees were 1.5 to 1.8 m tall and of medium to heavy crown density, with fresh weights of 6 to 12 kg. Four trees were cut at 0900 HR on 18 Dec. 1990 (time = 0), and the bases stood in tap water within 20 sec after cutting. Fresh weights were determined on these control trees within 15 min after cutting. The remaining 28 trees then were cut as quickly as possible in groups of four per treatment, with the time of cutting noted for each group. Throughout processing, cut surfaces of trunks were kept clean and unbruised. All trees were transported to a nearby barn and fresh weights recorded. Trees were stored in a horizontal position, not more than two trees deep, on a room-length table. Temperature and relative humidity were 22 ± 2C,

Rehydration of Fraser Fir Christmas Trees: Effect of Time since Cutting