Cedar Hedge Fertilization and Pruning Schedule for Quebec Climate

A Quebec homeowner seeks precise timing for fertilizing and pruning an 8–9 foot cedar hedge (Thuja occidentalis) with uneven height development.

Growth Cycle in Cold Climates

• Major flush: Spring (May–early July)
• Continued growth: Through fall until hard frost
• Dormancy: After leaf drop on deciduous trees

Fertilization Program

• Soil test first: Cedars prefer slightly acidic soil
• Balanced or high-N formula: 18-4-6 or 30-10-10
• Timing: Mid-spring (bloom time), June, July
• Rate: Per package for hedge square footage
• Water in thoroughly after each application

Pruning Schedule

• Spring shaping: Late May–early June
• Final trim: Early autumn only if necessary
• Critical: Don't prune deeply in fall—new growth won't harden before winter
• Watering: Continue until ground freezes

Height Disparity Solution

Shorter, thinner sections need more light. Selectively prune taller neighbors to reduce shading. Consistent fertilization and watering will improve density over time.