Hessian municipalities ban nighttime robotic mowers to protect hedgehogs, as injuries rise

Growing threat to hedgehogs

Hedgehogs in Hesse have been on the early warning list of the Red List of mammals since 2023, with populations steadily declining. The animals are often found in private gardens, where they search for food at dusk and during the night. Robotic lawnmowers operated after dark pose a lethal danger because the devices frequently lack sensors capable of detecting small animals. When threatened, hedgehogs roll into a ball and remain motionless, making them especially vulnerable to being run over and cut by the mower blades.

Municipal bans and enforcement

Several Hessian municipalities have responded with nighttime bans. Marburg introduced its prohibition at the end of 2025, and the district of Gießen issued a general decree on 1 May 2026. The cities of Hanau and the district of Kassel have also adopted bans. The restrictions apply from half an hour before sunset until half an hour after sunrise. Enforcement is primarily complaint-driven; authorities cannot continuously monitor all gardens. Marburg reports that fewer reports of injured or killed hedgehogs have been received since the ban took effect, though no formal statistics are kept. Carmen Schmidt from the Gießen district noted that many users are unaware of the danger and trust manufacturer claims about obstacle sensors, which she said are ineffective.

Unfortunately, far too many trust the manufacturers' claims that a sensor in the device can prevent the worst. That is not the case.

Injuries and wildlife impact

Tanja Schäfer of Wildtierhilfe Schäfer in Mücke (Vogelsbergkreis) said her station cares for about 500 hedgehogs each year, and at least 70 arrive with cutting injuries from robotic mowers. The wounds are often severe: split heads, missing noses or upper jaws, severed front legs, and deep abdominal cuts. Even minor injuries are usually fatal because flies lay eggs in the wounds, and the maggots consume the animal alive. Schäfer emphasized that the number of injured animals is rising as more devices enter the market, and the true toll is likely much higher because injured wildlife suffers silently and often dies unnoticed in bushes. Songbirds and amphibians such as frogs and newts are also at risk.

Most animals do not survive that, that is a fact.

The flies immediately lay eggs in the wound. Then the animal is eaten alive by the maggots.

Calls for wider action

The BUND Hessen environmental group is pushing for a comprehensive nighttime ban across the state. Naturschutzreferentin Josephin Bruhn argued that the devices should not be allowed to operate at all during the night and twilight hours. She noted that hedgehogs are particularly active at those times and that the lack of effective sensors makes the mowers indiscriminate killers. The group points to the existing municipal bans as a model, but wants a uniform regulation.

We want these devices simply not to be allowed to be switched on at night and during twilight.

What’s next

The bans in Marburg, Gießen, Hanau, and Kassel remain in effect, and authorities are relying on public awareness and citizen reports to ensure compliance. Marburg’s experience suggests that the measure may be reducing hedgehog injuries, but broader data is lacking. The BUND continues to advocate for a statewide prohibition, while wildlife rescue stations prepare for another season of injured animals.