Lanoyce Horticultural Nurseries, near Saltash, switched on its new biomass woodchip boiler last week.
The system will save the Peruvian Lily specialist up to £45,000 a year in heating costs.
Lanoyce supplies the flowers to UK supermarkets including Sainsbury's and has 17,000sq m of glasshouses to heat.
The 500kW boiler will save around 400 tonnes of carbon dioxide emissions per year compared to conventional energy.
The system was supplied by Devon-based firm Wood Energy and funded by the South West Bioheat Programme.
The South West Bioheat Programme, which is now closed, aimed to fund around 30 biomass heating projects with a £3.3 million fund from Defra.