Bostraze Nature Reserve forms part of the wider Bostraze Bog, one of the largest remaining wetland habitats in West Penwith. Once known by local farmers as ‘Cuckoo Valley’ the site is home to an intriguing array of wildlife.


Woon Gumpus Car Park, B3318
TR19 7TH

OS Map Reference

SW 394 334
A static map of Bostraze

Know before you go

23 hectares

Entry fee


Grazing animals

Yes, May to November


Please stay on footpaths.


Under effective control
Dog Walkers – please keep your dog on a lead to minimise disturbance to ground-nesting birds (in the summer), ground-feeding waders (in the winter), grazing animals and adders.

When to visit

Opening times

All year round

Best time to visit

All year round

About the reserve

Cuckoos are still a regular visitor to Bostraze. They arrive in the spring (from late April) and leave in June. Cuckoos are well-known brood parasites, the female lays her eggs in the nests of other birds, particularly meadow pipits. There are two carnivorous plants here at Bostraze – round leaved sundew and pale butterwort.

Both capture insects with their sticky leaves in order to obtain vital nutrients. They can be found in the wet, boggy areas, where cattle hoof-prints create bare ground for them to grow in.

The small red damselfly has become rare in West Penwith due to the draining of the wetland habitats. Our management of Bostraze’s wet grassland, mossy pools and the creation of seven ponds has created excellent breeding habitat for this species, which can be now be seen here from July to September.

As with many valley bottoms in Cornwall, there were casserite (tin ore) deposits beneath the peat and gravels. Tin streaming was a method of extracting the ore by washing away surface deposits to expose the casserite.

At the nature reserve’s lowest and most northerly point, the banks and guttrs are all that remain of the tin streaming process.

Contact us

Cornwall Wildlife Trust
Contact number: 01872 273939