One Tree Hill and Bitchet Common
Also within
Condition (Natural England)
| Unit | Feature | Condition | Area (ha) | Assessed |
|---|---|---|---|---|
| TQ560530 | — | Favourable | 4.36 | 2011-09-22 |
| TQ560532 | — | Unfavourable Recovering | 9.9 | 2022-04-20 |
| TQ562536 | — | Favourable | 10.35 | 2021-01-08 |
| TQ563538 | — | Favourable | 5.43 | 2021-01-08 |
| TQ564530 | — | Favourable | 6.67 | 2021-01-08 |
| TQ565535 | — | Favourable | 9.82 | 2021-01-08 |
| TQ569531 | — | Favourable | 3.77 | 2021-01-08 |
| TQ570530 | — | Favourable | 4.79 | 2022-05-12 |
| TQ572533 | — | Favourable | 1.95 | 2022-05-13 |
| TQ574536 | — | Unfavourable Declining | 10.16 | 2022-05-13 |
| TQ578535 | — | Favourable | 6.82 | 2011-09-22 |
| TQ578537 | — | Favourable | 5.22 | 2011-09-22 |
Climate exposure
This is about exposure to a nationwide pressure this habitat type carries — not a verdict on this site's own management.
Coastal habitats are exposed to sea-level rise and storm erosion. Where hard sea defences sit behind them, there's nowhere landward to retreat to — a squeeze that keeps compressing the habitat no matter how well it's managed.
Habitats
Ancient woodland, Bracken scrub, Coastal vegetated shingle, Coppiced woodland, Mixed scrub, Montane scrub
Geology & landscape
Rock Type: Chert, Greensand, Sandstone
Landscape processes: Coastal
Description
Area, 76.11 ha. 188.06 ac. Description Situated to the south east of Sevenoaks, this site comprises an extensive area of woodland of varied composition on the Lower Greensand. Some plants and invertebrates of restricted distribution are present, including the slug Tandonia rustica at its only known British locality. On the plateau, in the north of the site, the Lower Greensand is overlain by angular chert drift giving rise to acidic soils. To the south there is a steep scarp slope where the exposed ragstone a calcareous sandstone has resulted in contrasting soils of more base rich status. These varying soil types are reflected in the woodland composition. Much of the woodland is believed to be of ancient origin, though there are also areas of more recent and open secondary woodland. Bitchet Common has acidic soils supporting mixed woodland, sessile oak Quercus petraea and beech Fagus sylvatica predominate together with coppice of birch Betula sp. and some sweet chestnut Castanea sativa. Other tree and shrub species present include hazel Corylus avellana, holly Ilex aquifolium, yew Taxus baccata, whitebeam Sorbus aria and rowan S. aucaparia. The ground flora is dominated by bracken Pteridium aquilinum and bramble Rubus fruticosus agg. whilst other species such as heather Calluna vulgaris, bilberry Vaccinium myrtillus and heath bedstraw Galium saxatile are also frequent. The plateau of One Tree Hill supports a similar vegetation, though here there is also dense scrub principally of hawthorn Crataegus monogyna, blackthorn Prunus spinosa and elder Sambucus nigra. The top of Shingle Wood and the upper slopes of Broadhoath, Wet Bank and Martins Woods are also on similar soils to Bitchet Common. More mature trees are present in these areas and bluebell Hyacinthoides non-scripta is locally dominant in the ground flora. The valley of Martins Wood contains damp, more base rich soils. Coppiced ash Fraxinus excelsior often predominates here though there is also much hazel, field maple Acer campestre and alder Alnus glutinosa. Some large pedunculate oak Quercus robur standards occur. Bramble and bluebell are dominant in the ground flora of the drier areas whilst in the wettest parts they are replaced by species such as opposite leaved golden saxifrage Chrysosplenium oppositifolium, pendulous sedge Carex pendula and great horsetail Equisetum telmateia. The ragstone escarpment supports woodland of varied composition. There is much neglected coppice of ash and hazel together with some mature beech. Mature wych elm Ulmus glabra was formerly quite frequent but many specimens have been killed by Dutch Elm Disease A range of species characteristic of relatively base rich soils is found amongst the ground flora, this includes dog’s mercury Mercurialis perennis, early purple orchid Orchis mascula and green hellebore Helleborus viridis, the latter species being scarce in Kent*. Bryophytes, mosses and liverworts are frequent, including a liverwort with a predominantly western distribution, Porella arboris vitae found here at its only known locality in Kent. The escarpment is extremely steep in places and minor landslip are not infrequent. Such events open up the woodland and thus there are some areas containing dense scrub or ruderal vegetation. Although the invertebrate fauna has not been extensively, investigated, the ragstone escarpment in particular is known to support a variety of species of interest. The large and distinctive slug Tandonia rustica was discovered here, for the first time in Britain, in 1986. Also present are two nationally scarce** snails, the point snail Acicula fusca and Rolph’s door snail Macrogaster rolphii, both of which are typically found in ancient woodland. This is also the only known Kent site for the bristletail Dilta hibernica.* Scarce in Kent, recorded from between 1 and 5 percent of the 2km x 2km tetrads in Kent.** Nationally scarce, recorded from between 16 and 100 10km x 10km squares in Britain.
Species mentioned
Show the 29 species mentioned in the description, with red-list statusPlant communities
MC6 — Coastal vegetated shingle, Hard cliff and cliff slope
Atriplex prostrata-Beta vulgaris ssp. maritima sea-bird cliff community
Show 17 indicator speciesDaucus carota, Sonchus oleraceus, Taraxacum officianalis, Tripleurospermum maritimum, Cochlearia officinalis, Silene uniflora, Spergularia rupicola, Atriplex hastata, Malva arborea, Plantago coronopus, Armeria maritima, Polygonum aviculare, Rumex crispus, Bromus hordeaceous, Catapodium marinum, Dactylis glomerata, Festuca rubra
SD1 — Coastal vegetated shingle, Sand dune
Rumex crispus-Glaucium flavum shingle community
Show 35 indicator speciesSolanum dulcamara, Crithmum maritimum, Cirsium arvense, Cirsium vulgare, Helminthotheca echioides, Hypochaeris radicata, Jacobaea vulgaris, Lactuca serriola, Leontodon saxatilis, Senecio viscosus, Sonchus arvensis, Sonchus asper, Tripleurospermum maritimum, Crambe maritima, Cerastium fontanum, Honckenya peploides, Sagina apetala, Silene uniflora, Atriplex prostrata, Sedum acre, Euphorbia paralias, Lathyrus japonicus, Geranium robertianum, Glaucium flavum, Plantago coronopus, Plantago lanceolata, Rumex crispus, Potentilla anserina, Ammophila arenaria, Arrhenatherum elatius, Elytrigia atherica, Elytrigia juncea, Festuca rubra, Holcus lanatus, Lolium perenne
SD2 — Coastal vegetated shingle, Sand dune
Honkenya peploides-Cakile maritima strandline community
Show 30 indicator speciesSalsola kali, Achillea millefolium, Cirsium arvense, Eryngium maritimum, Hypochaeris radicata, Senecio vulgaris, Sonchus arvensis, Tripleurospermum maritimum, Cakile maritima, Cerastium diffusum, Honckenya peploides, Silene uniflora, Stellaria media agg., Atriplex glabriuscula, Atriplex laciniata, Atriplex littoralis, Atriplex patula, Atriplex prostrata, Sedum acre, Polygonum oxyspermum subsp. Raii, Rumex crispus, Potentilla anserina, Agrostis stolonifera, Ammophila arenaria, Arrhenatherum elatius, Elytrigia juncea, Elytrigia repens, Festuca rubra, Leymus arenarius, Poa annua
SD3 — Coastal vegetated shingle, Sand dune
Matricaria maritima-Galium aparine strandline community
Show 28 indicator speciesBolboschoenus maritimus, Juncus bufonius, Juncus gerardii, Ligusticum scoticum, Matricaria discoidea, Sonchus arvensis, Sonchus asper, Tripleurospermum maritimum, Mertensia maritima, Cakile maritima, Cochlearia officinalis, Honckenya peploides, Stellaria media agg., Atriplex glabriuscula, Atriplex patula, Atriplex prostrata, Triglochin maritimum, Plantago maritima, Armeria maritima, Rumex crispus, Glaux maritima, Galium aparine, Agrostis stolonifera, Elytrigia repens, Festuca rubra, Holcus lanatus, Leymus arenarius, Poa annua
W20 — Montane scrub
Salix lapponum-Luzula sylvatica scrub
Show 107 indicator speciesSalix arbuscula, Salix cinerea, Salix lapponum, Salix myrsinites, Salix phylicifolia, Salix reticulata, Empetrum nigrum, Calluna vulgaris, Salix lanata, Vaccinium myrtillus, Vaccinium uliginosum, Carex atrata, Carex bigelowii, Carex binervis, Carex flacca, Luzula multiflora, Luzula sylvatica, Huperzia selago, Selaginella selaginoides, Aulacomnium palustre, Mnium hornum, Philonotis fontana, Plagiomnium undulatum, Rhizomnium punctatum, Dicranum bonjeanii, Dicranum majus, Dicranum scoparium, Fissidens adianthoides, Racomitrium lanuginosum, Calliergonell cuspidatum, Ctenidium molluscum, Hylocomium splendens, Hypnum callichroum, Hypnum cupressiforme, Palustriella commutatum, Plagiothecium denticulatum, Plagiothecium undulatum, Pleurozium schreberi, Ptilium crista-castrensis, Rhytidiadelphus loreus, Rhytidiadelphus squarrosus, Rhytidiadelphus triquetrus, Sanionia uncinata, Scorpidium revolvens, Thuidium tamariscinum, Atrichum undulatum, Polytrichastrum alpinum, Sphagnum capillifolium, Sphagnum fallax, Sphagnum girgensohnii, Sphagnum palustre, Sphagnum russowii, Sphagnum squarrosum, Sphagnum subnitens, Sphagnum teres, Barbilophozia barbata, Chiloscyphus polyanthos, Diplophyllum albicans, Lophocolea bidentata, Plagiochila porelloides, Ptilidium ciliare, Scapania undulata, Cladonia squamosa, Peltigera canina, Angelica sylvestris, Caltha palustris, Hieraclium spp., Saussurea alpina, Solidago virgaurea, Campanula rotundifolia, Succisa pratensis, Valeriana officinalis, Rhodiola rosea, Vaccinium vitis-idaea, Thymus praecox, Epilobium anagallidifolium, Dactylorhiza viridis, Euphrasia officinalis, Rhinanthus minor, Oxalis acetosella, Oxyria digyna, Polygonum viviparum, Rumex acetosa, Anemone nemorosa, Ranunculus acris, Thalictrum alpinum, Alchemilla alpina, Alchemilla glabra, Filipendula ulmaria, Geum rivale, Galium boreale, Galium saxatile, Saxifraga aizoides, Saxifraga hypnoides, Saxifraga oppositifolia, Saxifraga stellaris, Viola riviniana, Agrostis canina, Agrostis capillaris, Anthoxanthum odoratum, Deschampsia cespitosa, Deschampsia flexuosa, Festuca ovina, Festuca rubra, Nardus stricta, Dryopteris dilatata, Phegopteris connectilis
W21 — Hedgerow scrub, Mixed scrub
Crataegus monogyna-Hedera helix scrub
Show 81 indicator speciesHedera helix, Salix cinerea, Acer pseudoplatanus, Ilex aquifolium, Betula pendula, Corylus avellana, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Malus sylvestris, Sorbus aria, Taxus baccata, Ulmus glabra, Ulmus procera, Sambucus nigra, Viburnum lantana, Euonymus europaeus, Cornus sanguinea, Juniperus communis, Ligustrum vulgare, Clematis vitalba, Rhamnus cathartica, Crataegus laevigata, Crataegus monogyna, Prunus spinosa, Juncus effusus, Plagiomnium undulatum, Brachythecium rutabulum, Kindbergia praelonga, Rhynchostegium confertum, Tamus communis, Heracleum sphondylium, Torilis japonica, Arum maculatum, Arctium minus, Cirsium arvense, Lonicera periclymenum, Moehringia trinervia, Silene dioica, Stellaria graminea, Stellaria holostea, Stellaria media agg., Calystegia sepium, Mercurialis perennis, Geranium robertianum, Iris foetidissima, Glechoma hederacea, Lamium purpureum, Origanum vulgare, Stachys sylvatica, Teucrium scorodonia, Allium ursinum, Hyacinthoides non-scripta, Circaea lutetiana, Rumex sanguineus, Anemone nemorosa, Ranunculus repens, Fragaria vesca, Geum urbanum, Potentilla sterilis, Poterium sanguisorba, Rosa arvensis, Rosa canina, Rubia peregrina, Rubus fruticosus agg., Galium aparine, Urtica dioica, Viola riviniana, Anisantha sterilis, Arrhenatherum elatius, Brachypodium pinnatum, Brachypodium sylvaticum, Bromopsis erecta, Dactylis glomerata, Elytrigia repens, Holcus lanatus, Holcus mollis, Poa trivialis, Asplenium scolopendrium, Pteridium aquilinum, Dryopteris filix-mas
W22 — Hedgerow scrub, Mixed scrub
Prunus spinosa-Rubus fruticosus scrub
Show 49 indicator speciesHedera helix, Acer campestre, Corylus avellana, Ulex europaeus, Prunus spinosa, Plagiomnium undulatum, Brachythecium rutabulum, Eurhynchium striatum, Kindbergia praelonga, Thuidium tamariscinum, Atrichum undulatum, Lophocolea bidentata, Achillea millefolium, Cardamine flexuosa, Lonicera periclymenum, Moehringia trinervia, Silene dioica, Silene uniflora, Stellaria media agg., Mercurialis perennis, Geranium robertianum, Stachys sylvatica, Teucrium scorodonia, Hyacinthoides non-scripta, Oxalis acetosella, Digitalis purpurea, Plantago lanceolata, Veronica chamaedrys, Armeria maritima, Rumex acetosa, Filipendula ulmaria, Geum urbanum, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Urtica dioica, Viola riviniana, Agrostis capillaris, Brachypodium sylvaticum, Dactylis glomerata, Festuca rubra, Holcus lanatus, Holcus mollis, Poa trivialis, Asplenium scolopendrium, Pteridium aquilinum, Dryopteris borreri, Dryopteris filix-mas
W25 — Bracken scrub
Pteridium aquilinum-Rubus fruticosus underscrub
Show 53 indicator speciesHedera helix, Acer pseudoplatanus, Fagus sylvatica, Quercus robur, Fraxinus excelsior, Sambucus nigra, Ulex europaeus, Crataegus monogyna, Prunus spinosa, Luzula multiflora, Mnium hornum, Brachythecium rutabulum, Kindbergia praelonga, Angelica sylvestris, Conopodium majus, Heracleum sphondylium, Arum maculatum, Cirsium arvense, Lonicera periclymenum, Silene dioica, Stellaria holostea, Mercurialis perennis, Geranium robertianum, Glechoma hederacea, Teucrium scorodonia, Hyacinthoides non-scripta, Chamerion angustifolium, Circaea lutetiana, Digitalis purpurea, Rumex acetosa, Anemone nemorosa, Ficaria verna, Potentilla erecta, Rosa arvensis, Rosa canina, Rubus fruticosus agg., Rubus idaeus, Galium aparine, Galium mollugo sens.lat., Galium saxatile, Urtica dioica, Viola riviniana, Agrostis capillaris, Anthoxanthum odoratum, Arrhenatherum elatius, Dactylis glomerata, Festuca rubra, Holcus lanatus, Holcus mollis, Poa trivialis, Pteridium aquilinum, Dryopteris dilatata, Dryopteris filix-mas