Cherry laurel (Prunus laurocerasus) is a popular evergreen shrub known for its glossy foliage and dense growth. Its versatility makes it suitable for hedges, privacy screens, or as an ornamental plant. A recurring concern for cultivators is their resilience to cold temperatures and potential freeze damage. This article discusses their freeze tolerance and protection measures during colder months.
Understanding Cherry Laurel Cold Hardiness
Cherry laurels exhibit varying degrees of cold hardiness. Most common varieties thrive in USDA Plant Hardiness Zones 6 through 9. This means they tolerate winter temperatures from 0°F to -10°F. However, this is a general guideline, and actual tolerance fluctuates based on specific conditions.
Several factors influence a cherry laurel’s ability to withstand cold. Mature, well-established plants typically show greater resilience than newly planted or younger specimens. The specific cultivar plays a significant role; varieties like ‘Otto Luyken’ or ‘Schipkaensis’ are known for enhanced cold tolerance. The planting site’s microclimate, such as a sheltered location or a frost pocket, can also impact survival. Adequate soil moisture levels before a freeze contribute to the plant’s ability to endure cold periods.
Protecting Cherry Laurels from Winter Damage
Proactive measures before winter reduce cold damage risk. Ensure plants receive sufficient water in late fall, especially evergreens, to prevent desiccation when the ground freezes. Apply a 2-4 inch layer of organic mulch, like wood chips or compost, around the base to insulate roots and retain soil moisture. Strategic site selection, avoiding low-lying frost pockets and providing windbreaks, offers long-term protection.
During severe cold snaps, immediate action can safeguard cherry laurels. For smaller plants, covering them loosely with burlap or frost cloths helps trap heat and shield them from drying winds. Ensure covers do not directly touch foliage, as this can lead to frost burn; use stakes or a frame to keep material raised. Avoid late-season fertilization, as it promotes tender new growth susceptible to cold damage.
Addressing Freeze Damage
Identifying freeze damage on cherry laurels involves observing symptoms such as browning or blackening of leaves, wilting, or even split bark. It is advisable to exercise patience after a cold event, as the full extent of the damage may not be immediately apparent, and some parts of the plant might recover. A thorough assessment is performed in late spring, once frost threat has passed.
Pruning dead or severely damaged branches is necessary for recovery. Perform a “scratch test” by gently scratching outer bark; green indicates living tissue, brown signifies dead wood. Cut all dead or visibly damaged sections back to healthy wood. This encourages new growth and restores the plant’s form.
Support the plant’s recovery with consistent care. Resume a regular watering schedule to aid recuperation and new foliage development. Avoid over-fertilization immediately after damage, as this can stress the plant. Instead, focus on general good care, allowing the cherry laurel to regenerate naturally.