Buchswald bei Grenzach, Nature reserve in Grenzach-Wyhlen, Germany.

Buchswald is a nature reserve in Grenzach-Wyhlen consisting of four separate forest areas with dense mixed deciduous woodland dominated by oak, beech, and lime trees. The reserve spans approximately 93 hectares and contains varied woodland types and habitats for diverse plant and animal species.

The boxwood stands of the Dinkelberg south slope were placed under protection in 1939 as the nature reserve Buchswald bei Grenzach (NSG 3.018). The box tree has grown in Wyhlen since the early Middle Ages, and its presence probably dates back to Roman times, when it was planted to edge gardens; Augusta Raurica lay just across the Rhine. In 2007 the fungus Cylindrocladium buxicola and the introduced box tree moth struck, and by late September 2010 the wild boxwood foliage was destroyed.

The boxwood from this forest has traditionally been crafted into wreaths that decorate local churches and homes during regional celebrations and festive occasions.

Several marked trails wind through the forest, enabling visitors to explore the different sections and observe the local plant life. The gentle terrain and established paths make the area straightforward to navigate, even for casual walkers.

The boxwood dieback began in 2007 with the fungus Cylindrocladium buxicola, which stripped plants bare up to 1.5 metres from the base across several dozen hectares. The Asian box tree moth, first recorded in the region the same year, had destroyed the foliage of the wild plants by late September 2010.