Why Windmühlenberg Nature Reserve stands out
Windmühlenberg is known above all for its surviving sand-dry grassland (Sand-Trockenrasen), a relict of steppe-like vegetation that has become exceptionally rare in the Berlin area. The reserve is one of the few places in the city where open, fire-prone sandy turf with characteristic grasses, low-growing herbs, and specialist wildflowers such as the Carthusian pink and the spring spurrey can still be observed. Beyond the grassland itself, the hill is recognized for its specialized fauna of ground beetles and grasshoppers adapted to dry, sparsely vegetated habitats, and for its role as a small but distinctive ecological island within the broader open-landscape mosaic of western Berlin at the foot of the Nauen Plateau.
Windmühlenberg Nature Reserve history and protected-area timeline
Windmühlenberg's modern history as a protected site begins with the ordinance establishing the Naturschutzgebiet Windmühlenberg, dated 17 December 2001 and officially announced on 9 February 2002. The ordinance framed the reserve's purpose around three explicit goals: preserving the characteristic sand-dry grassland flora as a threatened and increasingly rare Berlin vegetation type, securing habitat for endangered plants, reptiles, insects, and spiders, and safeguarding an ecologically significant location for research and teaching.
The cultural history of the hill itself is older and more unusual. From the mid-19th century until 1921, a post mill (Bockwindmühle) stood on the summit of the hill, serving as a widely recognized local landmark. In 1921, the owners sold the mill to film producer Richard Eichberg, who had it burned down as a dramatic effect for a film whose title is recorded as `Die Liebesabenteuer der schönen Evelyne oder Die Mordsmühle auf Evanshill.` The film itself is now considered lost. For decades afterwards the hill stood without its mill, until the local heritage initiative Förderverein historisches Gatow acquired a comparable mill from Metzelthin in the Prignitz region in 2004. After earlier plans to relocate it to Wriezen in the Oderbruch failed, the parts had already been dismantled and stored at the Wriezen station, from where the association transported them to Gatow. Between 2006 and 2008 the mill was reassembled at the edge of the nature reserve, in a location deliberately chosen to harmonize with the conservation requirements of the protected grassland.
Windmühlenberg Nature Reserve landscape and geographic character
Windmühlenberg is a low, glacial hill that reaches about 52 meters in elevation and rises only a few hundred meters west of the Havel river. Its gentle undulations are typical of the eastern margin of the Nauen Plateau, where ground moraine deposits from the Saale and Weichsel glaciations have been locally overlaid by end moraine features. As the plateau slopes down toward the Havel lowland, near-surface deposits of high-plateau sand become exposed, and these sandy, nutrient-poor substrates define both the surface of the hill and the surrounding field-flur landscape.
The hill itself is a compact, almost island-like feature within the surrounding open country: open sandy turf occupies the upper slopes, while the lower edges grade into hedgerow and oak-dominated fringes. To the north lie the former Gatow sewage farm fields, to the west and southwest the broad agricultural Gatow Feldflur with its network of hedges, and to the south the Gatow Heath. The combination of hill, heath, agricultural plain, and riverside lowland gives the site a layered, transitional character that is unusual within Berlin's mostly built-up territory.
Windmühlenberg Nature Reserve ecosystems, habitats, and plant life
Sand-dry grassland (Sand-Trockenrasen) is the defining ecosystem of Windmühlenberg and the principal reason for its protected status. This vegetation type is a relict of once more widespread steppe-like plant communities, and in Berlin it has become exceptionally rare. At Windmühlenberg the grassland consists of loose, sometimes patchy turf of grasses with a generally grey-green to brownish tone, interspersed with low-growing herbs and Colorful wildflowers that thrive on the dry, acidic, nutrient-poor sands.
The reserve's flora includes characteristic specialists such as the Carthusian pink (Dianthus carthusianorum), whose purple flowers brighten the slopes from June to September, the rare spring spurrey (Spergula morisonii), a typical sand specialist, and along the margins and fringes common soapwort (Saponaria officinalis), ground elder (Aegopodium podagraria), dog rose (Rosa canina), and pedunculate oak (Quercus robur). A central management objective, written into the reserve's ordinance, is to keep the grassland free of advancing shrubs and trees, so that the open sandy character of the habitat is preserved.
Windmühlenberg Nature Reserve wildlife and species highlights
The dry, sparsely vegetated character of Windmühlenberg's sandy turf supports a specialized insect and spider fauna typical of sand-dry grassland habitats. Ground beetles (Laufkäfer) and grasshoppers (Heuschrecken) are particularly characteristic. Among the species highlighted at the site are the protected blue-winged locust (Oedipoda caerulescens), which favors dry, vegetation-poor terrain, and the blue-winged sand grasshopper (Sphingonotus caerulans). The reserve's protection also extends to rare hymenopterans, weevils, and xylobiont beetles associated with the trees and hedges that fringe the open grassland.
The ordinance framing the reserve specifically identifies reptiles, insects, and spiders as priority groups to be conserved, alongside plants, reflecting the broader ecological value of the dry-sand habitat complex beyond its flora alone.
Windmühlenberg Nature Reserve conservation status and protection priorities
Windmühlenberg carries the official designation NSG-33 within the network of Berlin's roughly 35 protected nature reserves. The governing ordinance sets out three explicit conservation aims: preserving the sandy open areas with their characteristic sand-dry grassland flora as a threatened and rare Berlin vegetation type; safeguarding habitat for endangered plants, reptiles, insects, and spiders; and maintaining an ecologically important site for research and teaching.
Management practice follows directly from those aims. Keeping the central grassland free of encroaching woody growth is identified as one of the most important duties of the reserve's stewardship, and the site functions as an almost seamless ecological extension of the adjacent Gatow Feldflur landscape protection area, with its roughly 350 hectares of farmland and hedgerows. Together the two protected areas form one of the last large, coherent open-land complexes in Berlin, making Windmühlenberg disproportionately important for the long-term survival of sand-dry grassland and its associated fauna in the city.
Windmühlenberg Nature Reserve cultural meaning and human context
Windmühlenberg sits beside the historic village core of Gatow, a Spandau locality that has retained much of its village character despite belonging to Berlin. The hill itself once carried a post mill (Bockwindmühle) dating from the mid-19th century that served as the area's signature landmark until 1921, when the mill was sold to a film producer and burned as a set piece. The loss of the mill became a local cultural gap, and the early-21st-century rebuilding of a comparable mill by the Förderverein historisches Gatow is a small but meaningful act of cultural and landscape restoration, deliberately sited so as not to conflict with the reserve's conservation goals.
Best time to visit Windmühlenberg Nature Reserve
Late spring through early autumn tends to be the most rewarding time to experience Windmühlenberg, when the sand-dry grassland is in active growth and flowering, with the Carthusian pink lighting up the slopes in purple from June to September. The site's habitats, especially its insect and grasshopper fauna, are most active in warm, dry summer weather, which is also when the open sandy turf that defines the reserve is most expressive of its character; in winter the grassland remains a quiet, exposed sandy landscape of more subtle interest. Visitors should treat the protected turf as sensitive and stay on existing paths so that the rare species and fragile soil crusts are not damaged.
