Boulders provide a very budget-friendly retaining wall. When installed properl,y they will last a lifetime. They can also be used in the landscape for accent/decorative features.
The stones must fit together well, with most of the weight on the stone below, not the soil behind it. Due to the weight and shape of the rocks, no mortar is required when constructing a sturdy wall. A major advantage of boulder retaining walls is that they offer natural drainage.
Boulder and other rock retaining walls that are well-built should last upwards of 100 years or more. These walls are some of the most long-lasting landscape structures, lasting long after houses and barns have been destroyed.
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