The new varieties can be grown at temperatures between 14 degsC and 20 degsC, while previously temperatures of 17-23 degsC were required.
Managing director Mogens N Olesen said: "As the plants are genetically designed to require lower amounts of light and lower cultivation temperatures, they are also able to withstand longer transport distances.
"The plants are better acclimatised when they arrive at retail outlets and therefore have an enhanced shelf life, both in the shops and with consumers. We have ensured that the newly developed Clematis have no energy requirements whatsoever - apart from a frost-free environment."
He said future development in genetics and energy-saving measures such as climate control, lamps and curtains would bring further savings in the future.