Planter-brick, form for planter-brick, and method of making planter-brick

A form for casting a structural building unit out of which plants are able to grow, comprising:

• a front retaining wall assembly having a front extending interior plate;
• an internal form assembly having an internal extending interior plate and an internal form back plate;
• a central retaining wall assembly having a bottom wall, a left side wall, and a right side wall;
• a back retaining wall assembly;
• and
• a plurality of connectors;
• wherein the front extending interior plate and the internal extending interior plate form a front channel when the form is assembled, and wherein the front channel extends inward and downward from the front retaining wall assembly for casting a front portion of the structural building unit;
• wherein the back retaining wall assembly and the internal form back plate form a back channel when the form is assembled for casting a back portion of the structural building unit, wherein the back portion is vertically oriented;
• wherein the left side wall and the internal form assembly form a left side channel when the form is assembled for casting a left side portion of the structural building unit and the right side wall and the internal form assembly form a right side channel when the form is assembled for casting a right side portion;
• wherein the bottom wall of the central retaining wall assembly is configured to provide a bottom surface for the cast structural building unit;
• wherein the internal form assembly creates an internal void in the structural building unit;
• wherein the plurality of connectors removably couple each of the front retaining wall assembly, the internal form assembly, the central retaining wall assembly, and the back retaining wall assembly to one or more of the front retaining wall assembly, the internal form assembly, the central retaining wall assembly, and the back retaining wall assembly, and
• wherein the form is configured to cast the structural building unit to have the back portion extend from the left side portion to the right side portion, the front portion extend perpendicular to the left side portion and the right side portion, the front portion extend from the left side portion to the right side portion, and the front portion start from a front top edge of the structural building unit and form a portion of a top surface of the structural building unit and extend inward and downward to the bottom surface of the structural building unit, and the front portion form a portion of the bottom surface of the structural building unit.