Trees and bamboo plants caught fire near an Otay Mesa plant nursery Wednesday morning, fire officials said.
A helicopter was called to the scene in the 2300 block of Palm Avenue just before 6 a.m. Wednesday, according to the San Diego Fire Department.
The area is located near a riverbed and some trolley tracks, but no structures were threatened. Trolley service was not interrupted.
Fire crews knocked the fire down shortly upon arriving to the scene, though smoke could still be seen from the vegetation Wednesday morning.