SANTA ROSA, Calif. (AP) _ Hewlett-Packard Co. officials are investigating the origin of a plot of marijuana plants found growing on an undeveloped section of the company's property.

H-P security guards last week found more than 100 of the young plants and a drip irrigation system at the company's Santa Rosa facility, police said.

The plants, hidden in patches of brush, had been growing less than a year and would have yielded little if any, profit this fall, Sgt. Jerry Briggs said Monday. He declined to put a street value on them.

H-P spokesman Jeff Weber said the company planned to ask employees for any clues to who may have planted the marijuana.

But he said the 195-acre facility is mostly open space and ''it is conceivable that someone could have hopped the fence.''

Police did not return a phone call to The Associated Press on Tuesday, but Weber said officers told him no further police inquiry was planned.