Lea Green

Bastow Wood YWT


Site Details

Recorders: Ian Powell and Ian Court Distance: 3008 Walk Time: 1.5hours

Lea Green lies just to the east of Bastow Wood and is the site of quarrying for lead and limestone that needed a ready supply of timber for charcoal from the woods. It is also very close to Grass Wood and lies in Wharfedale. This transect covers an area of Carboniferous Limestone near Grassington, Wharfedale that supports flora typical of limestone grassland including Common Rock Rose Helianthemum nummularium. The transect route passes through a Northern Brown Argus colony before entering Bastow Wood, one of only two Ash-Hazel woodland pastures in the YDNP. The very thin unimproved limestone grassland and scree with some bracken


S1 is perfect for the Small Heath and the Northern Brown Argus abounds . S2 becomes more limestone pavement and then down into a very favoured gully of S3 Thes soils are at their thinnest in S1-3 perfect for Northern Brown Argus but also Dark Green Fritillary and Green Hairstreaks. You then descent down the slope towards Bastow Woods and longer grasses and scrub and encroaching birch with patchs of Rock rose The longer grasses are perfect for the Scotch Argus and Meadow Brown. By S7 you enter woodland with grassy glades and the grasses longer and the Speckled Wood and Vannesids favour. S9 is a green lane and hedgerow

Small Heath favour S2 and S3. Scotch Argus preferes S4 -5. Northern Brown Argus along with Meadow Brown prefer S1-3 The Fritillaries favour S3-4 . Green Hairstreak is mostly S1-2 . Common Blue S3. The Vannesids favour woodland of S7-9 .Speckled Wood S7 Wall was spotted in S9 this year

2021 Results

2021 sees a improvement over 2020 but not quiet as good as 2019 an exceptional year. The biggest improvemnt have been in Northern Brown Argus and Scotch Argus having bumper years . Small Heath along with Meadow Browns were up and it was great to see the Wall returning browns

Transect reports 2020

2020 Results

A pretty good year with the scarcer species holding up well with only Ringlet showing a decrease after the long hot summer of 2019 and drought of spring 2020 . Common Blue and particularly Small Tortoiseshell had a very good year. NB alot of the data is based on estimates as walk frequency was low.