Answer: Baptisia tends to grow very large and wide and is dense low to the ground, so you would need to take that into account in your planning. If you plant them in a row they will probably hide the wall eventually. A personal preference for a companion plant is Siberian iris because they bloom at the same time. Daylilies (Hemerocallis) or bulb lilies (Lilium)would also be nice because they would bloom later in the summer. All three of these are a nice textural contrast also. I also like purple coneflowers and the baptisia, for some reason the purple blooms look good to me against the baptisia foliage color. Another easy care possibility is ornamental grasses. All of these plants will grow nicely in a sunny area with average or better soil and can be left in place for many years. You might want to make a map to scale to see how much room you will really have, though -- baptisia is very deep rooted and difficult to move or remove once established.
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