Croes Robert Wood
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Habitats
Geology & landscape
Geological Feature: Gorge / Ravine · Rock Type: Limestone
Landscape processes: Fluvial
Description
Description The woodlands of the lower Wye Valley form one of the most important areas for woodland nature conservation in Britain, comparable with the Caledonian pinewoods, the oceanic oakwoods of western Britain, the New Forest and the mixed coppices of East Anglia. Unlike most other regions, semi-natural woodland is abundant and virtually continuous along the gorge. The woods are a mixture of many types, some of which are very localised, eg the lime-sessile oak stands on limestone; beech stands on both acid and alkaline soils in which lime, elm, oak and other species share dominance. Most woods are a rich mixture of stand types, which are believed to be similar in composition to the original natural woods of the valley. Many rare and local species are present, including some of the rarest native tree species (eg large-leaved lime, whitebeams), and trees close to the edge of their European range, eg hornbeam, beech. Furthermore, these woods sit in a matrix of unimproved grassland and other semi-natural habitats which, together with the woods, make the Wye Valley one of the most diverse, rich and attractive areas of southern Britain. Croes Robert Wood is an area of relict coppiced woodland with flushed acid soils on moderately steep slopes at the northern edge of the Trellech Plateau. Wych elm Ulmus glabra, ash Fraxinus excelsior, birch Betula pendula and cherry Prunus avium as both coppice and occasional standards predominate the upper slopes with more extensive areas of alder Alnus glutinosa coppice below. The wood also has an interesting bryophyte flora. Remarks: Within the Wye Valley Area of Outstanding Natural Beauty.
Species mentioned
Show the 5 species mentioned in the description, with red-list status| English name search for this in other sites |
Latin name search with Google |
IUCN / Red List | Type | Family |
|---|---|---|---|---|
| alder | Alnus glutinosa | LC | tree | salicaceae |
| birch | Betula pendula | LC | tree | betulaceae |
| ash | Fraxinus excelsior | LC | tree | oleaceae |
| wild cherry | Prunus avium | LC | tree | rosaceae |
| wych elm | Ulmus glabra | LC | tree | ulmaceae |
Insects to look out for
These moths, butterflies and beetles are known to feed on plants recorded at this site, and carry a notable UK conservation status — but a host-plant being present doesn't mean the insect has actually been recorded here. Treat this as "worth watching for," not a confirmed sighting.
| Species | Status | Via host-plant |
|---|---|---|
| Figure of eight Diloba caeruleocephala |
Endangered | Prunus spp. |
| The lappet Gastropacha quercifolia |
Endangered | Prunus spp. |
| Scarce vapourer Orgyia recens |
Endangered | Alnus glutinosa, Betula spp., Ulmus spp. |
| White-letter hairstreak Satyrium w-album |
Endangered | Ulmus glabra, Ulmus spp. |
| The sprawler Asteroscopus sphinx |
Vulnerable | Betula spp., Fraxinus excelsior, Prunus spp., Ulmus spp. |
| Broom moth Ceramica pisi |
Vulnerable | Betula spp., Ulmus spp. |
| Mottled umber Erannis defoliaria |
Vulnerable | Betula spp., Ulmus spp. |
| The lackey Malacosoma neustria |
Vulnerable | Betula pendula, Prunus spp., Ulmus spp. |
| Pale brindled Phigalia pilosaria |
Vulnerable | Alnus glutinosa, Betula pendula, Fraxinus excelsior, Ulmus glabra |
| Pale eggar Trichiura crataegi |
Vulnerable | Betula spp. |
| Oak hook-tip Watsonalla binaria |
Vulnerable | Betula pendula |
| Flounced chestnut Agrochola helvola |
Near Threatened | Betula spp., Ulmus spp. |
| Dusky-lemon sallow Cirrhia gilvago |
Near Threatened | Ulmus glabra |
| The sallow Cirrhia icteritia |
Near Threatened | Ulmus glabra |
| Dingy mocha Cyclophora pendularia |
Near Threatened | Alnus glutinosa |
| Kentish glory Endromis versicolora |
Near Threatened | Alnus glutinosa, Betula pendula |
| Large thorn Ennomos autumnaria |
Near Threatened | Alnus glutinosa, Betula spp., Prunus spp., Ulmus spp. |
| September thorn Ennomos erosaria |
Near Threatened | Betula spp. |
| Dusky thorn Ennomos fuscantaria |
Near Threatened | Fraxinus excelsior |
| Autumnal rustic Eugnorisma glareosa |
Near Threatened | Betula spp. |
| Double dart Graphiphora augur |
Near Threatened | Betula spp., Ulmus spp. |
| White prominent Leucodonta bicoloria |
Regionally Extinct | Betula spp. |
Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.