Clematis is flowering in my vertical garden – will it eventually snap?

hanging plants for wall planters

flowering hanging plant in white

How beautiful is this flower? Clematis ‘Early Sensation’ began opening yesterday and today the flowers moved from green to white. In these photos you can see two of these Clematis climbers being used as trailing plants. I planted them on the edge of the Woolly Pockets and have allow them to hang over the wall planters to provide a flowering edge to this trial vertical garden.

I am slightly concerned that the weight of the plant might snap the trunk.   Anyone?