Santa Barbara City firefighters on scene of a mulch fire on the 1200 block of Miramonte Drive. Crews responded to reports of smoke seen just before 5 p.m. Monday.
Firefighters were dispatched there twice on Saturday and twice on Monday.
Fire officials said the mulch pile spontaneously combusted in the backyard of private residence.
Fire crews are connecting their hoses to fire hydrants on Miramonte Drive near Bel Monte Drive. Miramonte Drive at Carrillo was closed while firefighters worked to dampen the pile.
The mulch pile is very dense and thick. A tractor is working to thin out the pile and reduce the heat produced.