As a result of changes in climate, Plantscape is asking customers whether they want floral displays to remain until October rather than September, which is the norm.
Plantscape managing director Mark Stone said: "There is nothing worse than having to take down and scrap perfectly good displays that could still have a couple of weeks of life in them if the weather stays warm.
"This would be especially true this year, which thanks to the fantastic weather in the May to June growing season has seen some of our best-ever displays.
"There is every chance we could get another Indian summer this year, which is why we are willing to rearrange our schedules so that if customers want to keep their flowers a little bit longer, they can."
The company, based in Hulland Ward near Ashbourne in Derbyshire, currently supplies floral displays to more than 300 local authorities across the country.