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  • Journal of the American Society for Horticultural Science x
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Abstract

Boron (B) tolerance of 25 ornamental shrub species was determined in large, outdoor sand cultures. Tolerant species such as Natal plum (Carissa grandiflora (E. H. Mey.) A. D. C.), Indian hawthorn (Raphiolepis indica (L.) Lindl.), Chinese hibiscus (Hibiscus rosa-sinensis L.), oleander (Nerium oleander L.), Japanese boxwood (Buxus microphylla Siebold and Zucc.), bottlebrush (Callistemon citrinus (Curtis) Stapf), ceniza (Leucophyllum frutescens (Berland.) I. M. Johnst.), and blue dracaena (Cordyline indivisa (G. Forst) Steud.) were affected little, if at all, by 7.5 mg B/liter in the irrigation water. Sensitive species like yellow sage (Lantana camara L.), juniper (Juniperus chinensis L.), Chinese holly (Ilex cornuta Lindl. and Paxt.), Wax-leaf privet (Ligustrum japonicum Thunb.), laurustinus (Viburnum tinus L.), thorny elaeagnus (Elaeagnus pungens Thunb.), xylosma (Xylosma congestum (Lour.) Merrill), photinia (Photinia ☓ Fraseri Dress.), and Oregon grape (Mahonia aquifolium (Pursh) Nutt.) were severely damaged or killed by 7.5 mg B/liter and moderately damaged by 2.5 mg B/liter in the irrigation water. B tolerance and B accumulation in the leaves were not correlated and no correlation was found between B tolerance and salinity tolerance.

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