Frost Damage to Shrubs

Identification

• Initial symptoms include browning or blackening leaves. New shoots and flowers start to discolor similarly. Shrubs growing in low-lying landscape areas or frost pockets display discoloration only in lower areas of the plant. There is a distinct downward curl of tips on evergreen shrubs. These tips turn red or brown within a couple of weeks.

Susceptibility

• Improper hardening off is a frequent cause of frost injury in shrubs. "Hardening off" is a process through which shrubs and trees naturally prepare for cold weather. The process slows plant growth, making them less susceptible to frost. Plants planted late in the season do not harden sufficiently, hence become more prone to frost damage.

Management

• Avoid excessive irrigation and fertilization from the middle of August to leaf fall. This helps in the hardening process. Don't plant in low areas, as these develop frost pockets. There is no cure for frost-damaged shrubs. Use plants that are well adapted to local growing conditions.