How to build a cheap garden rock wall or a simple concrete reinforced retaining wall. If you do not have much money and can't easily fix stuff you probably can still build these simple retaining walls.
Commonly called Basket of Gold, perennial alyssum makes a wonderful wall or rock garden plant. Every spring it develops masses of cheerful yellow flowers that look terrific tucked between rocks and boulders. - Flower Beds and Gardens
This free-form retaining wall posted by Garden Ideas Picture is so beautiful I can hardly stand it! I love how natural the boulders and pebbles look on the hill. And it’s awesome that plants can be mixed into the retaining wall area! - My Garden