Guest if you type Buddleja davidii into the search box at the top right of the screen you will see lots of images of the shrub.

Agree with MG, always best to look at a photo, but here's a description - between 4 and 10 inches long, roughly 2/3 inches wide at the widest point, light green, white grey underneath, soft textured, rather floppy as they age, deciduous.