The American Federation of State, County and Municipal Employees union is objecting to a plan by Detroit city officials to turn over an abandoned nursery to Greening of Detroit, a nonprofit group. What’s the problem, exactly?

Using privately raised funds and volunteers, the group would restore the nursery and use it to provide mature trees to neighborhoods. Greening already plants 2,000 trees a year throughout the city.

But the American Federation of State, County and Municipal Employees obtained an injunction from Wayne County Circuit Court against the deal, saying it violates the collective bargaining agreement. The union says the bargaining agreement applies to any deals to turn over control of city operations to a third party — meaning city workers must staff the nursery.

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Terrence King, director of the city’s General Services Department, called the union’s position baffling. Not only would no city workers be displaced, but there should be more work for city forestry workers once the trees are grown, he said.

Baffling is an understatement. But if these volunteers were paying forced union dues like Detroit city employees must do, we doubt the union bosses would be objecting.