Hydrangea anomala ssp. petiolaris Oh grow up! That’s what I tell people who say they have no more room in their gardens. What I mean is vertical. To add another dimension to the garden I like to plant tall plants that stay narrow and get good height. Dahlia imperialis Besides giving you a little more room it also adds more interest not to have all the plants about the same height. An example is, in one bed I have a Rhamnus ‘Fine Line’, a Berberis ‘Helmond Pillar’ and Dahlia i