Firefighters were called out to Methleigh Bottoms, Porthleven on Saturday after a report of a fire.
One appliance from Helston was mobilised just after 7pm, with the crew extinguishing a small area of pampas grass using a high pressure hosereel jet.
A spokesman said that arson was suspected and that Devon & Cornwall Police have been informed.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here