The free house wall is to be greened, but there is a paved area in front of it. A photo with dense greenery reaching up to the upper storeys appeals to you. The first planning question is not which plant will reach that image fastest. First it must be clear where the plants will root and how this substrate can be supplied on a long-term basis.
Two basic approaches to distinguish
The planning guidance of the Umweltbundesamt describes soil-bound and wall-bound façade greening. It names various options for design, planting and irrigation. [WURZEL] The choice is therefore a system decision; a free wall area alone does not yet describe a complete site.
Our editorial recommendation: First have clarified whether a suitable planting area in the ground is present or could be created. What actual constraints exist at this location? An empty rectangle on the floor plan is not proof of freely usable substrate. Existing services, rights and the structural prerequisites must be checked separately for the project.
A missing bed is not an automatic mandate for a wall system
If planting in the ground is not suitable, another solution can be considered. Please request a complete description of the intended root space and its supply. Which planting containers or system elements are included, what irrigation is planned and how will the required work be made accessible? The answer must fit the specific site and the planned vegetation.
Also compare a smaller greening area or a different location if the desired setup becomes disproportionately elaborate. This is an editorial decision aid, not a general ranking of greening systems. A plan may lead to a different green appearance than the initial inspiration.
Organise long-term supply realistically
Ask before purchase what supply and maintenance the chosen option requires and who will take it on. How will longer absences be cared for? What happens if a planned technical component fails? Have these questions explained product-specifically, rather than assuming automatic irrigation is a universally maintenance-free solution.
In the fictional example a household wants to green a tall, previously unplanted wall. Because of the paved area a purchased wall module initially seems the simple choice. In the consultation the root space, supply and safe maintenance are described accessibly. The household then decides between a fully planned wall solution and a differently arranged, smaller planting. The later maintainability is the deciding factor.
The house wall remains part of the specialist planning
Fixing, wall compatibility and required accesses must be professionally clarified before execution. Ownership consents, local requirements and, where applicable, further permits will be checked separately. This article neither explains a self-made suspension nor a specific plant for every façade.
For your decision it should be recognisable in the end where the greenery has its basis and how it is supplied there. A realistic root and maintenance concept is what makes the desired façade image a plausibly selectable solution.