These dense or prickly plants create barriers that deter either people or small animals from walking where they are not wanted.
| Common Name | Botanical Name |
| Alpine currant | Ribes alpinum |
| Cotoneaster | Cotoneaster |
| Firethorn | Pyracantha |
| Fragrant sumac | Rhus aromatica |
| Japanese barberry | Berberis thunbergii |
| Jasmine | Jasminum |
| Juniper | Juniperus |
| Oregon grape | Mahonia |
| Rose | Rosa |
| Siberian cypress | Microbiota decussata |