Sensitivity of plants to specific ions
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Relative tolerances of shrubs to boron
| Botanical name |
Common name |
Tolerance* |
| Abelia grandiflora (Andre) Rehd. |
glossy abelia |
sensitive |
| Buxus microphylla Siebold and Zucc. |
Japanese boxwood |
tolerant |
| Callistemon citrinus (Curits) Stapf |
bottlebrush |
tolerant |
| Carissa grandiflora (E.H. Mey) |
natal plum |
highly tolerant |
| Cordyline indivisa (G. Forest) Steud |
blue dracaena |
moderately tolerant |
| Elaeagnus pungens Thunb. |
thorny elaegnus |
moderately tolerant |
| Euonymus japonica Thunb. |
spindle tree |
moderately tolerant |
| Feijoa sellowiana O. Berg |
pineapple guava |
moderately tolerant |
| Ilex cornuta Lindl. and Paxt. |
Chinese holly |
sensitive |
| Juniperus chinesis L. |
juniper |
sensitive |
| Lantana camara L. |
yellow sage |
sensitive |
| Leucophyllum frutescens (Brtland) I. M. Johnst |
Texas ranger, ceniza |
tolerant |
| Ligustrum japonicum Thunb. |
wax-leaf privet |
tolerant |
| Mahonia aquifolium (Pursh) Nutt |
Oregon grape |
sensitive |
| Nerium oleander L. |
oleander |
tolerant |
| Photinia x fraseri Dress |
photinia |
moderately tolerant |
| Pittosporum tobira (Thunb.) Ait. |
Japanese pittosporum |
sensitive |
| Platycladus orientalis (L.) Franco |
Oriental arbovitae |
moderately tolerant |
| Podocarpus macrophyllus (Thunb.) D. Don |
southern yew |
tolerant |
| Raphiolepis indica (L.) Lindl. |
Indian hawthorn |
tolerant |
| Rosmarinus officinalis L. |
rosemary |
moderately tolerant |
| Syzygium paniculatum Gaertn. |
brush cherry |
tolerant |
| Viburnum tinus L. |
laurustinus |
moderately tolerant |
| Xylosma congestum (Lour.) Merrill |
xylosma |
sensitive |
Key to tolerance ratings:
| Rating |
Definition |
| highly tolerant |
plant uninjured when irrigated with water containing 6 mg/L to 10 mg/L boron |
| tolerant |
leaves uninjured when plant irrigated with water containing 4 to 6 mg/L boron, but plant may be severely injured when irrigated with water containing 6 to 10 mg/L boron |
| moderately tolerant |
leaves uninjured when plant irrigated with water containing 2 mg/L boron, but plant may be severely injured when irrigated with water containing 4 to 6 mg/L boron |
| sensitive |
plant’s leaves severely burned, especially at the tips, when irrigated with water containing 1 mg/L to 2 mg/L boron |