Building a Tree Bed Retaining Wall: Back Side Materials When Hidden by Fence

A 2-3 ft high tree bed for spruces with fence at back: should the hidden back use the same decorative material?

Recommendation: Yes, Use Same Material

• Structural consistency — same block = same stability.
• Cost difference minimal vs. mixed materials.
• Future-proof: if fence removed, both sides look finished.
• Easier construction — one system, one skill set.

Alternative (If Budget Critical)

Back only: concrete block (CMU) with parge coat. But savings small vs. hassle.

Key Detail

Ensure drainage behind wall: gravel backfill, perforated pipe at base, fabric. Spruces hate wet feet.

Build it right all around — the back matters even if unseen.