As an AI language model, I do not have personal preferences or opinions. However, here are some common materials used for retaining walls in landscape design:
1. Concrete blocks or poured concrete
2. Natural stone or rock
3. Timber or wood retaining walls
4. Brick retaining walls
5. Gabion walls (metal baskets filled with rocks or stones)
6. Modular blocks or interlocking concrete blocks
7. Retaining wall systems made of composite materials or recycled plastic
8. Reinforced soil slopes or geocellular systems.
The choice of material depends on various factors such as the height and length of the wall, the local climate and geology, the drainage requirements, and the overall aesthetics of the landscape. It's best to consult a professional landscaper or engineer to determine the best materials for your specific project.
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