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Baptisia australis – Blue False Indigo

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Blue false indigo, Baptisia australis, is easy to grow, drought tolerant, hardy across a huge swath of the U.S., and attractive to bees and butterflies.

Blue false indigo is a native perennial.

I cannot fathom how many photographs I have taken of blue false indigo. It is a favorite plant and somehow the images never measure up. Today, my children Flynne and Ian were behind me, clamoring for a picture of a bee, never mind the Baptisia.

Finally, I took a good photograph of blue false indigo by taking a picture of a bee for my children.

blue false indigo
Blue false indigo in detail + bee.

Blue false indigo may be the finest Baptisia of all.

The flowers are regal blue and stand strong on very stout stems. Blue false indigo grows to 4 feet tall with a similar spread. It is a big plant. Baptisia australis blooms in mid-spring, reaching its peak as the roses and foxglove come into bloom.

blue false indigo

Some sources recommend the need to stake false indigo, which I frankly find ludicrous. I have never needed to stake a false indigo of any kind. In my experience, if you need to stake a blue false indigo it is growing in way too much shade.

Stalwart garden perennial blue false indigo has spikes of blooms approximately 18" tall.
Blue false indigo has spikes of blooms.

Blue false indigo blooms a tad later than other false indigos

Yellow false indigo, white false indigo, and some of the hybrids like Carolina Moonlight and Praireblues Twilite are other easy to grow selections. You grow all of these in the garden with similar technique. For me, this means lots of sun and don’t sweat the rest.

False indigo grows well in poor soils. It grows well in great soils. Baptisia can handle drought; it can handle lots of rain. Stay away from poorly drained soils if possible. Shade is acceptable but you risk floppy plants. Be patient and give false indigo a couple of years to really get going.

It is hardy zones 3-9.

blue false indigo
The top half of blue false indigo is the part to highlight. Do not hesitate to plant other perennials, including fairly tall ones, in front of Baptisia australis.

As mentioned in my other writings on the subject of Baptisia, false indigo sprawls all over the place after blooming. Give false indigo room to spread and/or plant it in the back of the border.

Blue false indigo has a deep root system and does not tolerate transplanting.

I’ve read recommendations to use Baptisia in naturalized gardens and this is good advice. Most often you see false indigo grown in a casual manner standing all on its own. False indigo is a weirdly formal plant in some ways, most likely because it grows fairly stiffly.

Frankly, there is nothing special about the lower half of false indigo. I much prefer to surround false it with plants of similar height and breadth. One of the prettiest displays of false indigo I have seen was Carolina Moonlight tucked behind a relatively tall growing dark Penstemmon digitalis.


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