The boulevard collection (also known as 'Top to Bottom' Clematis) are a series of 11 different colours that all flower for 6 months! Yes thats May to Oct constant ! they grow 3-4 feet so the are ideal for growing in tubs, pots, planters. We've even got them growing in Hanging baskets and troughs. They are great at covering other clematis that have got bare at the bottom, or along picket fences ect. some choose to grow them out of old chimney pots too!
The way in which they flower from 'Top to Bottom', is that they have been bred to flower from the leaf axels (thus flowering all the way up and down the stem)