Upland Acid Grassland BNG Units
High
Grassland
Trusted by Developers and Landowners
What is Upland Acid Grassland?
Upland Acid Grassland is a mix of fine grasses, mosses and small herbaceous plants adapted to low pH and limited nutrients. This habitat appears as an open grassy landscape, often dominated by mat grass or purple moor grass. Texture and color come from all patches of tormentil, heath bedstraw and scattered mosses.
Why It Matters for BNG
Upland acid grassland offers medium distinctiveness units and supports upland ecological networks. Grazing based management suits upland BNG strategies.
Managing grazing, controlling scrub and maintaining soil acidity enables landowners to supply BNG units from extensive upland pastures.
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Where You'll Find It
Upland acid grassland occurs across upland landscapes where soils remain acidic and nutrient poor. It often sits alongside upland heath, bog habitats, wet rush pasture and scattered scrub. These mosaics contribute to upland ecological connectivity and landscape character.
Soil and Site Requirements
This habitat requires acidic soils below pH 5.5. Soil types range from shallow, free draining mineral soils to deeper peaty deposits on wetter ground. Maintaining low nutrient conditions is essential. Lime, fertiliser or heavy disturbance reduce habitat quality and alter species composition.
How New Upland Acid Grassland Is Created
Inputs
• Maintain soil acidity and avoid lime or nutrient addition
• Encourage natural colonisation from nearby upland grassland
• Introduce characteristic grasses, herbs and mosses where required
• Control invasive species before they establish
Management
• Apply grazing to maintain open structure and prevent scrub encroachment
• Adjust grazing pressure to avoid overgrazing and bare ground
• Retain moisture gradients to support rushes and transitional vegetation
• Allow natural disturbance where it benefits characteristic species
Landscape
• Restore grassland within upland mosaics of heath, bog and wet pasture
• Position restoration where long term grazing agreements can be secured
• Connect isolated grassland areas to strengthen upland habitat networks
How Existing Upland Acid Grassland Is Improved
Inputs
• Remove scrub, bracken or aggressive grasses where they suppress fine grassland
• Restore soil acidity where past management increased pH
• Reduce nutrient inputs from adjacent land or runoff
• Introduce missing herbs or bryophytes where diversity has declined
Management
• Use controlled grazing to maintain species richness
• Manage wetter areas to retain rushes and peat influenced swards
• Monitor plant communities and adjust management to maintain structure
• Prevent succession to woodland or heath where inappropriate
Landscape
• Reconnect fragmented grassland patches across upland slopes
• Restore adjacent upland habitats to increase ecological continuity
• Manage recreational a
Target Condition
Upland acid grassland in its defined BNG condition should:
• Support characteristic grasses such as sheep’s fescue, bent grasses, mat grass and purple moor grass
• Contain herbs such as tormentil and heath bedstraw within a balanced sward
• Maintain low nutrient soils with pH below 5.5
• Present open structure with moss rich patches in suitable areas
• Avoid dominance by scrub, bracken or coarse grasses
• Demonstrate appropriate grazing and natural disturbance
The BNG Value of Upland Acid Grassland
• Distinctiveness: Medium
• Condition Potential: Moderate to high where nutrient control and grazing maintain structure
• Habitat Connectivity: Links upland heath, bogs and wet rush pasture, supporting birds, invertebrates and upland fungi
• Climate and Landscape Context: Contributes to resilient upland ecosystems with stable vegetation adapted to harsh conditions
Species Typical of Upland Acid Grasslands
Canopy or Primary Layer
• Sheep’s fescue (Festuca ovina)
• Bent grasses (Agrostis species)
• Mat grass (Nardus stricta)
• Purple moor grass (Molinia caerulea)
Shrub or Secondary Layer
• Heather (Calluna vulgaris)
• Bilberry (Vaccinium myrtillus)
• Sparse scrub on habitat margins
Ground Flora or Understorey
• Tormentil (Potentilla erecta)
• Heath bedstraw (Galium saxatile)
• Devil’s bit scabious (Succisa pratensis)
• Common bird’s foot trefoil (Lotus corniculatus)
• Common hair cap moss (Polytrichum commune)
• Soft rush (Juncus effusus)
• Sharp flowered rush (Juncus acutiflorus)
• Lesser pond sedge (Carex acutiformis)
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Frequently Asked Questions
What is Upland Acid Grassland?
Found at higher altitudes on acidic, nutrient-poor soils, characterized by grasses like Mat Grass (Nardus stricta) and Bilberry (Vaccinium myrtillus). It is a priority habitat.
How is BNG measured here?
Condition is assessed by the cover of positive indicator species (like Bilberry, heather, or certain mosses) and the extent of aggressive species (like Mat Grass or dense Bracken).
How can I achieve BNG?
Enhancement through appropriate grazing regimes (typically low-intensity) and management to prevent scrub encroachment or erosion.
What is the BNG target condition?
A Good condition is one with a varied sward structure, a good mix of grasses and forbs/dwarf shrubs, and no evidence of heavy erosion.
What management is required?
Low-intensity grazing, often by hardy breeds, is essential to maintain the sward structure and prevent dominance by aggressive grasses. Burning is a traditional, but often controversial, management tool.
Exploring Other Habitats?
Hazel Scrub
Hazel scrub is a native scrub habitat dominated by hazel, typically forming dense multi-stemmed shrubs or coppice stools usually less than 5 metres in height. It commonly occurs along woodland edges, ride margins, hedgerow networks and as transitional scrub developing on former grassland or farmland.
Hazel scrub provides structural habitat for birds and small mammals and produces nuts, catkins and leaf litter that support invertebrates and woodland food webs. It may also function as a transitional habitat facilitating woodland regeneration.
Lowland Heathland
Lowland heathland is a semi-natural habitat dominated by dwarf shrubs growing on nutrient-poor, acidic soils in the lowland zone, generally below about 300 metres above sea level. The vegetation is typically dominated by ericaceous species such as heather, bell heather, and cross-leaved heath, often with gorse species.
Lowland heathland usually occurs as a mosaic habitat, containing patches of dwarf shrub heath alongside acid grassland, bare ground, scattered scrub or trees, and occasionally wet heath or small bog areas.
Bramble Scrub
Bramble scrub is a dense scrub habitat dominated by bramble , typically forming thick thickets between 2 and 3 metres in height. It commonly occurs along woodland margins, grassland edges, road and rail embankments, brownfield land and other disturbed areas as part of natural vegetation succession. All bramble scrub parcels are also recorded as poor condition in the metric, regardless of their structure or species composition.
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