Clematis ‘Celebration’ was bred by company owner Fred Godfrey who introduced it at the show.
"This is our exciting new launch for 2011," said Godfrey.
"I found it in 98 but we have had to learn about the plant a lot before we could get it ready for market. The amazing thing about it is the earliest flowers are really big doubles and the early ones have the hold on the double aswell. In late summer the flowers are single."
The company has about 7,500 saleable plants.
They currently sell nationwide but Godfrey said he planned to "pull back into Essex, Kent and the M4 corridor" to cut back on transport costs.
But he confirmed the company would up production levels for next year following a positive couple of years.
For more on Woking growers end of season plans see Horticulture Week 23/07.