Performance of Selected Herbaceous Annual Ornamentals Grown at Decreasing Levels of Irrigation

• Published in: HortScience Vol. 41; no. 6; pp. 1481 - 1486
• Main Authors: Henson, D.Y, Newman, S.E, Hartley, D.E
• Format: Journal Article
• Language: English
• Published: Alexandria, VA American Society for Horticultural Science 01.10.2006
• Subjects: Agricultural and forest climatology and meteorology. Irrigation. Drainage; Agronomy. Soil science and plant productions; appearance (quality); Biological and medical sciences; drought; drought tolerance; evapotranspiration; Fundamental and applied biological sciences. Psychology; General agronomy. Plant production; irrigation rates; irrigation requirement; Irrigation. Drainage; lawns and turf; nursery crops; ornamental plants; plant adaptation; plant growth; Poa pratensis; turf grasses; water stress; Colorado; Irrigation; Horticulture; Ornamental crop; Annual plant; Irrigation rate; Bedding plants; Angiospermae; Evapotranspiration; Water engineering; Spermatophyta; Level; Herbaceous plant; Performance; Drought
• ISSN: 0018-5345; 2327-9834
• DOI: 10.21273/hortsci.41.6.1481

This study was conducted to evaluate the growth, visual quality, and stress response of 17 species of bedding plants and Kentucky bluegrass (Poa pratensis L.) grown outdoors for 10 weeks during the summer of 2003 at three locations in Colorado. Plants were irrigated at 100% of the reference evapotranspiration (ET(0)) (amount required to maintain Kentucky bluegrass in an optimum condition) for 2 weeks followed by 8 weeks at five irrigation levels: 0%, 25%, 50%, 75%, and 100% ET(0). Begonia carrieri Hort. 'Vodka', Lobelia erinus L. 'Cobalt Blue', and Viola xwittrockiana Gams. 'Crown Gold' grew well with a minimum of 50% or more ET(0) based on Kentucky bluegrass. Impatiens walleriana Hook. fil. 'Tempo White' grew well only with 100% ET(0). Antirrhinum majus L. 'Sonnet Yellow', Dianthus L. 'First Love', Lobularia maritima (L.) Desv. 'Carpet White', and Pelargonium xhortorum L.H. Bailey performed well with 25% to 50% ET0. The species Catharanthus roseus (L.) G. Don 'Peppermint Cooler', Rudbeckia hirta L. 'Indian Summer', Senecio cineraria D.C. 'Silver Dust', Tagetes erecta L. 'Inca Yellow' and T. patula L. 'Bonanza Gold', Zinnia angustifolia Kunth., and Salvia farinacea Benth. 'Rhea Blue', which are adapted to midsummer heat and low water, performed well with 0% to 25% ET0. Species considered to be heat or drought tolerant--Petunia xhybrida hort. ex. E. Vilm. 'Merlin White' and Glandularia J.F. Gmel. 'Imagination'--required little or no irrigation. The bedding plant species evaluated in this study that required 25% or less ET(0) are well adapted for low-water landscape installations.