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Decline of certain container-grown ornamental species during the hottest months of summer is a common problem for nurserymen in the southeastern United States. When roots are killed due to high root-zone temperatures and growth ceases, production of plant hormones also decreases. A study was conducted with Early Harvest PGR (Griffin LLC, Valdosta, Ga.), which contains cytokinins, gibberellic acid, and indole butyric acid, to determine if this product would improve the growth of five ornamental species that typically decline during the summer in south Georgia nurseries. The species used were  Cotoneaster dammeri  Schneid. `Coral Beauty',  Cotoneaster salicifolius  Franch. `Green Carpet',  Spiraea japonica  L. `Shirobana',  Thuja occidentalis  L. `Little Giant', and  Weigela florida  (Bunge) A. DC. `Minuet'. The treatments (control, 1.5 and 3.0 mL Early Harvest PGR/1125 mL water) were applied every 2 weeks from mid-June until mid-Sept. 1999 as a foliar drench. Treatment of both  Cotoneaster  species and the  Thuja  with Early Harvest PGR resulted in little influence on plant growth. While growth indices did not increase, shoot dry mass of  Spiraea  and  Weigela  increased 17% and 26%, respectively, when treated with Early Harvest PGR at the medium rate. Plant quality ratings for  Spiraea  increased when the 1.5-mL rate of Early Harvest PGR was applied. A rate of 3.0 mL of Early Harvest PGR on  Spiraea  decreased shoot and root dry mass, total biomass, root ratings, and final plant quality. Root ratings and plant quality were highest for  Weigela  grown with the 1.5-mL Early Harvest PGR treatment. These results indicate that treatment of woody ornamentals with Early Harvest PGR for positive results is both species- and rate-dependent.

224 Influece of Early Harvest PGR on the Growth of Five Ornamental Species