The preserved material consists of treating nature in a special way so that it loses those components that degrade it so that they are preserved and do not deteriorate. They do not need maintenance.
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They need more substrate since they house shrub species and even trees. The thickness of the layer will be from approximately 20 cm, providing the garden with flowers and walkable areas.
It needs more maintenance and watering than extensive covers.
- It does not collect CO2 or emit oxygen, so it has no anti-pollution work
- It does not have the same insulating power, both thermal and acoustic, as a natural garden.
- It can be affected if the environment is not taken care of, such as light, contact with harmful agents, etc.