Other jar pockets were filled with mazus (Mazus reptans), usually used as a ground cover. Its slender stems and small leaves spill down the sides of the container, and small, white, pealike flowers appear in the spring. Above the mazus, the reddish-purple whorled foliage of 'Vera Jameson' sedum (Sedum 'Vera Jameson') tops the pot. This sedum produces pink flowers in dome-shaped clusters, but its foliage truly makes it special.
The wall-mounted pot received interesting foliage plants as well. 'Elijah Blue' fescue (Festuca glauca 'Elijah Blue') looks like spiked hair rising from the top of the planter. A blue-green sedum (S. sieboldii) pours out the bottom, and strawberry begonias fill in the middle holes.
These combinations worked for me, but you can use any plant that needs well-drained soil. Just make sure to use plants that share the same growing conditions. Remember, you can even fill your strawberry jar with strawberry plants.