Just off the side of the front porch, I have Lily of the Valley (convallaria majalis). It likes moist, fertile, well drained-soil to grow in. It will grow in partial shade but prefers complete shade.
Hello from me and my shadow!
Right next to the Lily of the Valley, I have Russian Sage (Perovskia atriplicifolia) It grows well in any sunny, well-drained location.
The only thing these two plants both seem to want is well-drained soil. So, why do I have them next to each other? Well, it sorta just happened.
The Russian Sage plants were here when we bought the house. We didn't know what they were. They were planted in nice straight rows from the porch to the fence along with some autumn sedum and arborvitae. Most of the arborvitae died. We rescued a few and moved them to the back yard where they are now keeping me from my previous rain gauge post. I knew what the autumn sedum was and that it needed more sun. It was moved to the back yard and seems to be happy there. Getting rid of the straight lines, we moved all the Russian Sage together in between the two windows and waited to see what it would do. It grew and bloomed. We never watered it. Great! We found out later that Russian Sage is suppose to have more sun, but since it seems to be doing well where it is, we're not moving it. It gets sun almost all morning. We leave it up all winter to catch snow and cut it to the ground in the spring. It spreads and it seeds. I have to dig up and pull out Russian Sage plants around the edges to keep it contained.
Now, what to put between the Russian Sage and the porch (I knew it needed to be something low growing so it wouldn't flop onto the porch). There was Lily of the Valley at a house we rented once and it smelled so nice. I thought the little space by the porch would get shade most of the day and it would get extra water from the porch roof. I put in a few Lily of the Valley plants that have now filled in the space they share with daffodils.
Sometimes, the Russian Sage and Lily of the Valley grow in each other's spaces. Apparently, they're friendly neighbors!