A fire broke out early Tuesday at a nursery in Rancho Bernardo.
San Diego Fire-Rescue crews were called to Highland Valley Road just after 5 a.m. for a vegetation fire.
No structures were threatened by the fire and no injuries have been reported, SDFD spokesperson Capt. Joe Amador said.
The fire created a lot of smoke and generated calls from worried residents who saw the plume of smoke from a distance, Amador said.
The cause is under investigation.
SDFD officials said it appears to be a mulch fire.
No other information was immediately available.
Check back for updates on this breaking news story.