Plantable retaining wall block and retaining walls thereof

A plantable retaining wall block comprising:

• a front side, a back side and sidewalls extending therebetween, each of the front side and the back side having an outwardly facing profile;
• a plantable cavity disposed between the front side and the back side, and open at a top side of the plantable retaining wall block;
• an upwardly extending ridge oriented parallel to the front side and back side, and extending upwards at a side of the plantable cavity proximal to the back side;
• at least three recesses in a bottom side of the plantable retaining wall block for receiving the upwardly extending ridge of at least one other of the plantable retaining wall blocks when assembled in a wall,
• wherein:
• when a first recess of the at least three recesses receives the upwardly extending ridge of the at least one other of the plantable retaining wall blocks oriented in the same front side facing direction, a plantable retaining wall is formed;
• when a second recess of the at least three recesses receives the upwardly extending ridge of the at least one other of the plantable retaining wall blocks oriented in a reverse front side facing direction, a free-standing wall is formed;
• when a third recess of the at least three recesses receives the upwardly extending ridge of the at least one other of the plantable retaining wall blocks oriented in the same front side facing direction, a retaining wall is formed;
• and
• when the free-standing wall is formed the plantable cavity of the at least one other of the plantable retaining wall blocks is inaccessible and the front side and back side of the plantable retaining wall blocks in the free-standing wall are aligned to form a perpendicular wall.