Indian Hawthorn Research Articles

Chemically Induced Branching of Woody Landscape Plants

Abstract Axillary budbreak of Ilex Crenata Thunb. ‘Helleri’ and ‘Ilex vomitoria’ Ait. ‘Stoke's Dwarf’ hollies was promoted by a single BA (N-(phenylmethyl)-1H-purin-6-amine) application of 125–1000 ppm compared to an unpruned control. Budbreak of Photinia × Fraseri Dress was stimulated by 500–2500 ppm BA and 2000–5000 ppm Promalin (BA + GA4+7). Budbreak in Nandina domestica Thunb. ‘Harbour Dwarf’ increased with 1000–2500 ppm BA and 2000–5000 ppm Promalin application. Budbreak of Rhododendron × ‘Formosa’ azalea was promoted by 2000 and 2500 ppm BA and 2000–5000 ppm Promalin. Axillary budbreak of Ternstroemia gymnanthera (Wight & Arn.) T. Sprague) and Raphiolepis indica (L.) Lindl. was not affected by BA or Promalin application.

Boron Tolerance of Twenty-five Ornamental Shrub Species1

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.