Rooftop greening failures do not occur suddenly one day.
Plants decline.
Greenery fails to spread.
Maintenance cannot be sustained.
Systems are left without renewal and eventually neglected.
These outcomes are not problems that arise at that moment.
They are the result of decisions made much earlier, whose effects surface gradually over time.
The Five Perspectives Revisited
The five perspectives organized on this site—
・How the rooftop environment is understood
・The assumptions behind plant selection
・The relationship between systems, plants, and operations
・How warranties and inspections are perceived
・How aging and renewal are anticipated
—are not independent issues.
Each individual decision may seem small.
However, when these judgments accumulate without being connected, rooftop greening gradually shifts into a structure that is inherently difficult to sustain.
There Is No Single Point of Fix
The key point is this:
this is not a problem that can be solved by fixing just one element.
Even if plants are changed,
even if the system is redesigned,
even if maintenance is intensified,
the same problems will reappear in different forms
if the underlying structure of assumptions has not been clarified.
What Long-Term Success Really Looks Like
A rooftop greening project that is truly stable is not one that is
“barely maintained” through warranties, inspections, or equipment.
It is a state in which—
even as time passes,
even without major interventions—
the greening continues naturally and without strain within the rooftop environment.
The Question That Matters Most
What is needed is not the search for the “right” product or system.
What matters is revisiting the structure of judgments on which a plan is built.
This site does not exist to push readers toward specific choices.
Nor is it intended to否否否 criticize anyone’s decisions.
Rather, whether you are planning a new project
or reflecting on a past one,
this site is meant to help you ask:
“Is this judgment still viable when I consider the condition several years from now?”
It organizes the perspectives and structural thinking needed to ask that question honestly.
Being able to ask it—
or not—
is the first real turning point that separates successful rooftop greening from failure.
Back to Site Top▶
The Structure Behind Sound Judgment▶
Structures That Lead to Failure▶
