HOUSTON – A massive fire burned for hours at a mulch company in northwest Harris County.

The fire broke out around 10:15 p.m. at The Ground Up in the 9900 block of Windfern.

Investigators said high heat caused a large pile of mulch to combust.

VIDEO: Massive fire burns at northwest Harris County mulch company

Cy-Fair firefighters brought in heavy equipment to knock down the fire, which was contained by about 8:30 a.m. Tuesday.

Luis Chamorro, vice president of sales and marketing at the company, said it would be open for business Tuesday.

Firefighters said no homes or nearby businesses were affected by the fire.

The Ground Up is an organic mulch, soil and compost manufacturing company, its website says.