The German classification system for maintenance intensity and quality auditing of municipal green spaces.

FLL Pflegeklassen 1 through 5 form the backbone of German municipal green space management. Each class defines a complete set of maintenance parameters that dictate how often an area is mowed, how rigorously weeds are controlled, when hedges and shrubs are pruned, and what level of cleanliness is acceptable. The system is not merely a quality label but a contractual instrument: German municipalities assign a Pflegeklasse to every green space polygon in their asset register, and maintenance contracts reference these classes to set service level agreements with external contractors.

PK 1 (Optimale Intensivpflege) represents the highest maintenance intensity. These are representative areas such as ornamental gardens, civic plazas, and formal park sections where the aesthetic standard must be impeccable. Lawns are mowed weekly to maintain a height below 4 cm (Zierrasen), weed tolerance is effectively zero, edges are trimmed after every mow, and litter must be removed daily. PK 2 (Normale Pflege) covers standard residential green spaces, playgrounds, and general-use parks. Mowing occurs fortnightly, lawn height is maintained between 4 and 10 cm (Gebrauchsrasen), and minor weed presence below 5% is acceptable. PK 3 (Reduzierte Pflege) applies to roadside greenery and transition zones where functional maintenance takes priority over aesthetics. Monthly or bi-monthly mowing cycles are typical, and weed coverage up to 20% is tolerated provided it does not create safety hazards.

PK 4 (Minimale Pflege) covers extensive meadow areas and peripheral zones where only one to two cuts per year are scheduled. The focus shifts entirely to traffic safety, primarily maintaining clearance profiles (Lichtraumprofil) along roads and paths. PK 5 (Naturhafte Pflege) is reserved for biotopes, nature conservation areas, and ecological compensation sites. Maintenance is limited to a single late-autumn cut or targeted interventions for habitat management. In the digital form, the inspector selects the assigned Pflegeklasse (Soll) at the start of the assessment, establishing the benchmark against which all element conditions are evaluated.

For cemetery-specific green space maintenance in Germany, see the BIV Richtlinie Cemetery standard.

A single green space typically contains multiple element types that may each require different evaluation criteria. A city park, for example, might include ornamental lawns (PK 1 standard), general-use paths (PK 2), and a peripheral meadow strip (PK 4). The digital form implements this through a repeatable Element Inspection block where the inspector selects the Element Group (Elementgruppe) and then assesses criteria specific to that element type.

For Lawns and Meadows (Rasen & Wiesen), the inspector records the current growth height (Wuchshöhe), cut appearance (Schnittbild), and weed infestation level (Unkrautbesatz). Growth height is classified into four ranges: below 4 cm for ornamental lawns (Zierrasen), 4–10 cm for utility lawns (Gebrauchsrasen), 10–30 cm for landscape lawns (Landschaftsrasen), and above 30 cm for meadows (Wiese/Langgras). The acceptable height depends directly on the assigned Pflegeklasse. A PK 1 area with grass above 10 cm represents a serious deviation, while the same height in a PK 3 area is within the expected range.

For Shrubs and Hedges (Gehölze & Hecken), the pruning status (Schnittzustand) and clearance profile (Lichtraumprofil) are the primary assessment criteria. The clearance profile is legally critical under German Verkehrssicherungspflicht (duty to ensure public safety): hedges must not obstruct sight lines at intersections or reduce path widths below 2.5 meters for cycle paths and 4.5 meters for roads. Paths and Plazas (Wege & Plätze) are evaluated for surface condition (Belagszustand), including potholes, trip hazards exceeding 2 cm, and washout damage on unbound surfaces. Each element also receives a binary traffic safety assessment (Verkehrssicher), flagging any condition that poses an immediate public hazard.

For detailed tree visual inspection methodology, see the FLL Baumkontrolle standard.

The FLL Pflegeklassen condition rating uses the classic German Schulnoten (school grades) scale from 1 to 5. Critically, these grades do not measure absolute quality but relative compliance: a PK 4 meadow strip with 15% weed coverage can earn a grade of 1 (Sehr Gut) because that condition meets the PK 4 target, while the same weed coverage in a PK 1 ornamental garden would produce a grade of 5 (Mangelhaft) because it massively deviates from the PK 1 zero-tolerance standard.

Grade 1 (Sehr Gut / Very Good) indicates that the area perfectly corresponds to its defined Pflegeklasse. For PK 1 and PK 2 areas this means zero weeds, precisely trimmed edges, lawns at the target height, and complete cleanliness. Grade 2 (Gut / Good) allows slight deviations that do not impair the visual impression or functional use. Individual weeds in a PK 2 lawn, or a bin at 75% capacity, are typical Grade 2 conditions. Grade 3 (Befriedigend / Satisfactory) signals visible deviations where the care target is recognizable but the area is currently lagging behind schedule, such as lawn height exceeding the target by 20% or noticeable weeds in flower beds.

Grade 4 (Ausreichend / Sufficient) indicates strong deviations where the visual appearance is neglected and functional performance is barely maintained. Hedges slightly obstructing paths, significant weed infestation, or overflowing bins characterize this grade. Grade 5 (Mangelhaft / Defective) means the Pflegeklasse target is definitely not met. Functional failure or safety defects are present: paths are overgrown, trip hazards exist, or safety-relevant pruning has been missed. In the form, the inspector selects the Gesamtzustandsnote (overall condition rating) and can document the reason for deviation (Abweichungsgrund) from a multi-select list including weather, vandalism, maintenance backlog, or site problems.

What makes the FLL Pflegeklassen audit distinct from generic green space inspections is its contractual foundation in the Soll-Ist-Vergleich (Target vs. Actual Comparison). The inspector does not simply grade the overall appearance of a park. Instead, each element is evaluated against the specific thresholds defined by its assigned Pflegeklasse. This creates a structured, reproducible assessment that can be used to verify contractor performance against service level agreements.

The process begins when the inspector selects the Objektart (Object Type) and Pflegeklasse (Soll) in the form header. This establishes the benchmark. A Spielplatz (Playground) assigned to PK 2 sets expectations of fortnightly mowing, less than 5% weed coverage, and clean cut appearance. The inspector then walks the site, recording the actual state of each element. For lawns, the Wuchshöhe (growth height) and Unkrautbesatz (weed infestation) are compared directly against the PK 2 thresholds. For paths, the Belagszustand (surface condition) is checked against the requirement of no trip hazards exceeding 2 cm.

The deviation analysis is captured in three ways. First, the Gesamtzustandsnote (overall condition rating) quantifies the gap between target and actual on the 1-to-5 scale. Second, the Abweichungsgrund (reason for deviation) multi-select field documents whether shortfalls are caused by weather (Witterung), vandalism (Nutzung/Vandalismus), maintenance backlog (Pflegerückstand), or site problems (Standortprobleme). Third, the Empfohlene Maßnahme (recommended action) field prescribes the corrective response: no action required (Keine), intensify routine maintenance (Regelpflege intensivieren), schedule an ad-hoc maintenance visit (Sonderpflegegang), carry out repairs (Reparatur/Instandsetzung), or perform a deep clean (Grundreinigung). This three-part deviation capture ensures that the inspection not only identifies problems but also traces their root cause and prescribes the appropriate response.

The FLL publishes its green space maintenance guidelines through the FLL (Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau). Municipal application guidance is coordinated by the GALK (Deutsche Gartenamtsleiterkonferenz).