Diagnosing and Treating Browning Fraser Firs and Cedar Trees

Identifying the Problem

Fraser firs and cedars (often arborvitae) that turn brown from the bottom up may be suffering from fungal disease, aphid infestation, or drought stress. If browning is only in the interior, it’s likely natural needle shed. But when the outer foliage browns—especially from the base upward—it signals a more serious issue.

Common Causes

• Fungal diseases: Such as needle cast or root rot, often worsened by wet conditions.
• Aphids or spider mites: Suck sap, causing discoloration and decline.
• Water stress: Both overwatering (poor drainage) and underwatering can cause similar symptoms.

Recommended Treatment

An organic option like Atomic Grow can help by raising the plant’s brix (sugar) levels, improving overall health and pest resistance. Apply as a soil drench and foliar spray weekly for three weeks. Ensure proper watering: keep soil moist but not waterlogged, and allow the root zone to dry slightly between waterings.

Availability

Atomic Grow can be purchased online. Alternatively, local garden centers carry fungicides and miticides for targeted treatment.

Prevention Tips

• Plant in well-drained soil.
• Monitor for pests regularly.
• Water deeply but infrequently to encourage deep roots.
• Mulch to conserve moisture and reduce stress.