A Gottingen group calling itself "A Few Autonomous Flower Children" said in an open letter several pounds of marijuana seeds were spread around the city as a protest against Germany's "restrictive drug policies," Spiegel Online reported Monday.
"We can't set eyes on this useful and beautiful plant because it's absolutely forbidden in Germany to grow it," the letter read.
The letter said the group can't understand "why cannabis, unlike alcohol, cannot be legally purchased."
Gottingen police spokeswoman Jasmin Kaatz said officers are using photos posted to the website of the Green Youth, the youth chapter of the Green Party, to identify the locations of the plants and destroy them. She said investigators are seeking the planters for potential narcotics charges.
Detlef Johannson, spokesman for the city government, said police and parks officials have so-far discovered and destroyed 70 plants and more are expected as the investigation continues.