May Perennial of the Month-False Indigo

One of the most striking native perennials for our area is the false indigos. Baptisia australis, with its royal purple blooms, and Baptisia sphaerocarpa, with its sunny yellow flowers, are both so structural that they are sometimes confused as shrubs. Both species are naturally found in prairie or glade-type environments and are adept at tolerating poor soils and drought once established.

Full sun is key to making false indigos happy, where they can grow 3 to 4’ high and wide in large clumps.

After blooming, the lupin-like blooms are replaced by showy pods useful in floral arrangements.

The common name is attributed to early colonists who tried using the plant for dye like the true indigo plant, Indigofera tinctoria, one of the oldest dyes used for centuries.

The strong vertical lines of false indigo make it a great companion to other perennials, like the ‘Husker Red’ Penstemon in the photo below.

What I love about this plant;

-It’s native!

-Intense blue or yellow spiky blooms.

-Very structural for a perennial.

-Showy pods can be used in floral arrangements.

What’s not so great;

-Can get floppy, especially after a heavy rain. Supports like those used for peonies can help or shearing entire plant down to half its height right after it blooms.

-Does not transplant well once established. Choose your location well and leave it.

-Aphids seem to be the primary pest of Baptisia, causing pale leaves with a sticky residue. Insecticidal soap can be helpful.

-Comments or questions? Email Garden-Lou at gardenloustl@gmail.com

Words and photos by Jo Batzer

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