UPDATED: August 23 at 4:11 p.m.
Investigators have determined the fire at Grand View Nursery in Hannibal to be accidental in nature.
Investigators aren't sure exactly what started the fire. But a hired investigation company from St. Louis and the Missouri State Fire Marshal's office think it started in the northern part of the attic.
There were ventilation fans in the attic, so the blaze went undetected for some time before the owner discovered it as he was leaving Saturday night.
The fire spread quickly to the retail space, which contained fuel, oil and plastics.
Volunteers and firefighters were able to save about $324 thousand worth of equipment.
There were no injuries reported, but a shop cat was believed to have died in the fire.
A fire broke out at the Grand View Nursery south of Hannibal just after 5:30 p.m. Saturday.
Crews spent more than three hours battling the fire. Traffic on Highway 61 continued to be rerouted as more tankers arrived on scene. Our Facebook viewers says smoke could be seen from Quincy as well as Hull, Kinderhook and Barry.
The building is a total loss.