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Habitat type: Grassland - Lowland dry acid grassland
Habitat type: Grassland - Lowland dry acid grassland
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Written by Oliver Lewis
Updated over 9 months ago

Photo kindly provided by UKHAB ©.

The following is a short summary of the habitat type and how to create/enhance it to a "good" condition. For an informed position, please refer to official up-to-date UKHAB documentation or the UK Government's Condition Assessment Sheet.

This is a grassland that meets at least two of these three criteria:

1. >12 species per m² (including grasses and excluding bryophytes);

2. >30% cover of broadleaved herbs and sedges (excluding White Clover Trifolium repens, Creeping Buttercup Ranunculus repens and injurious weeds);

3. <10% cover of rye grasses and White Clover Trifolium repens.

AND ≥4 of these indicators are classed as ‘present’ on the DAFOR scale.

AND ≥1 of these indicators are classed as ‘frequent’ on the DAFOR scale.

AND ≥3 of these indicators are classed as ‘occasional’ on the DAFOR scale

Key Species ("indicator species")

Bell heather (Erica cinerea)

Betony (Betonica officinalis)

Bilberry (Vaccinium myrtillus)

Bird’s foot trefoil (Lotus corniculatus)

Biting stonecrop (Sedum acre)

Bitter-vetch (Lathyrus linifolius)

Buck’s-horn plantain (Plantago coronopus)

Common centaury (Centaurium erythraea)

Common dog-violet (Viola riviniana)

Common stork’s-bill (Erodium cicutarium)

Devil’s-bit scabious (Succisa pratensis)

Harebell (Campanula rotundifolia)

Heath bedstraw (Galium saxatile)

Heath dog-violet (Viola canina)

Heath milkwort (Polygala serpyllifolia)

Heath speedwell (Veronica officinalis)

Heather (Calluna vulgaris)

Lady’s bedstraw (Galium verum)

Lesser hawkbit (Leontodon saxatilis)

Lichens (Various)

Lousewort (Pedicularis sylvatica)

Maiden pink (Dianthus deltoides)

Mouse-ear hawkweed (Pilosella officinarum)

Pale dog-violet (Viola lactea)

Parsley-piert (Aphanes arvensis)

Pignut (Conopodium majus)

Saw-wort (Serratula tinctoria)

Sheep’s sorrel (Rumex acetosella)

Sheep’s-bit (Jasione montana)

Shepherd’s-cress (Teesdalia nudicaulis)

Slender parsley-piert (Aphanes australis)

Tormentil (Potentilla erecta)

Wild thyme (Thymus drucei)

How to Create / Enhance to a "Good" condition

There are a set of criteria that are used to judge the condition of this habitat. These are listed below.

Condition Assessment Criteria

Criterion passed (Yes or No)

A

The parcel represents a good example of its habitat type, with a consistently high proportion of characteristic indicator species present relevant to the specific habitat type (and relative to Footnote 3 suboptimal species which may be listed in the UKHab description).1

Note - this criterion is essential for achieving Moderate or Good condition for non-acid grassland types only.

B

Sward height is varied (at least 20% of the sward is less than 7 cm and at least 20% is more than 7 cm) creating microclimates which provide opportunities for insects, birds and small mammals to live and breed.

C

Cover of bare ground is between 1% and 5%, including localised areas, for example, rabbit warrens2.

D

Cover of bracken Pteridium aquilinum is less than 20% and cover of scrub (including bramble Rubus fruticosus agg.) is less than 5%.

E

Combined cover of species indicative of suboptimal condition3 and physical damage (such as excessive poaching, damage from machinery use or storage, damaging levels of access, or any other damaging management activities) accounts for less than 5% of total area.

If any invasive non-native plant species4 (as listed on Schedule 9 of WCA5) are present, this criterion is automatically failed.

Additional Criterion - must be assessed for all non-acid grassland types

F

There are 10 or more vascular plant species per m2 present, including forbs that are characteristic of the habitat type (species referenced in Footnote 3 and 5 cannot contribute towards this count).

Note - this criterion is essential for achieving Good condition for non-acid grassland types only.

Condition Assessment Result

Condition Assessment Score

Acid grassland types (Result out of 5 criteria)

Passes 5 criteria

Good (3)

Passes 3 or 4 criteria

Moderate (2)

Passes 2 or fewer criteria

Poor (1)

Non-acid grassland types (Result out of 6 criteria)

Passes 5 or 6 criteria, including essential criterion A and additional criterion F.

Good (3)

Passes 3 - 5 criteria, including essential criterion A.

Moderate (2)

Passes 2 or fewer criteria;
OR
Passes 3 or 4 criteria excluding criterion A and F.

Poor (1)

Notes

Footnote 1 - Professional judgement should be used alongside the UKHab description.

Footnote 2 – For example, this could include small, scattered areas of bare ground allowing for plant colonisation, or localised patches not exceeding 5% cover.

Footnote 3 - Species indicative of suboptimal condition for this habitat type include:creeping thistle Cirsium arvense, spear thistle Cirsium vulgare, curled dock Rumex crispus, broad-leaved dock Rumex obtusifolius, common nettle Urtica dioica, creeping buttercup Ranunculus repens, greater plantain Plantago major, white clover Trifolium repens and cow parsley Anthriscus sylvestris. There may be additional relevant species local to the region and or site.

Footnote 4 – Assess this for each distinct habitat parcel. If the distribution of invasive non-native species varies across the habitat, split into parcels accordingly, applying a buffer zone around the invasive non-native species with a size relative to its risk of spread into adjacent habitat, by applying professional judgement.

Footnote 5 – Wildlife and Countryside Act 1981 (as amended).

Useful Resources

If you are interested in enhancing or creating this habitat, you should consider the following (all recommended by CIEEM):

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