Ploughableland is already insufficient for a growing population.
But we can increase their area vertically.
For this purpose it is necessary to build walls with special building blocks. These blocks are filled with an soil and arranged so that there is a space for plants between them.
There are two variants of such masonry: longitudinal and cruciform:
Blocks have openings in the bottoms in such a way that the soil of all the walls is a entire mass. It is very convenient for root system of plants and for irrigation.
Such a way of stacking blocks is nowhere in the world. At least we have not seen, although we have searched a lot on the Internet.
These blocks can also be half-round, triangular
if you want the fence to be smoothed by the outside party.
More complex configurations are possible
for example, for the cladding of old walls, these "cubes" have the hemispherical shape.
Additional details are also provided. For example, the longitudinal blocks may not be too long, but assembled. This option simplifies production and transportation. Methods of assembly may be different depending on the design.
Тhese blocks themselves can be fully prefabricated from individual parts as well as the formwork described below.
Existing plastic pots for plants have no such ergonomic shape as to build green walls from them. These green blocks are more compact and stable.
All these forms can be made of different materials
plastic, concrete, etc.
So the cost price will be no more than by other building materials.
When the fittings is applied, the cost price increases by a maximum of 30
50 cents per block.
In the case of plastic it is necessary to change only the mold without additional cost.