As an AI language model, I do not have personal preferences or opinions on what materials are "best", but here are some common options for creating retaining walls in a landscape design:
1. Concrete blocks - durable and versatile, can be stacked into various shapes and sizes.
2. Natural stone - attractive and can blend in with surroundings, but more expensive and difficult to work with.
3. Wood - treated lumber or railroad ties can be cost-effective, but may not last as long as other materials and can be prone to rotting.
4. Brick - can give a classic look to a landscape, but may not be as strong as other materials and can be difficult to work with.
5. Gabion walls - wire cages filled with rocks or other materials, can be a unique and eco-friendly option.
6. Corten steel - a weather-resistant steel that creates a modern and industrial look, but may not be as cost-effective as other options.
Ultimately, the best material will depend on factors such as the site conditions, design goals, and budget for the retaining wall project. It is important to consult with a professional landscaper or contractor for guidance on selecting the optimal material for your specific situation.
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