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False Indigo
Baptisia
False Indigo blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing False Indigo
Plant it in full sun. It prefers low water. It is hardy in USDA zones 3–9. Expect it to reach about 3.5 ft tall and 3 ft wide at maturity, in roughly 3 years (checked).
What was checked
Fifteen fields were checked against named botanical sources, each recorded beside the sources that carried it, with every unsettled point written down and decided: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, soil, diseases, pests, toxicity, the plant's own names, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Each fact above carries its own mark. The planting, spacing and size sections are derived from these checked facts by a fixed rule, not checked separately, and the plant type is the library's own classification.
When to plant False Indigo
Plant False Indigo in early spring as soon as the soil is workable, or in early fall at least six weeks before your first frost, so roots establish in cool weather. In zone 6, the middle of its hardy zones 3 to 9, spring means March to May and fall means August or September. Once settled, it blooms from May to June.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 6, the middle of this plant's hardy range, start with zone 6 in March. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does False Indigo get?
3.5 fttall5 ft 7 inan adult3 ftwideSee False Indigo in a garden plan: the planner shows it in 3D beside everything else you add, growing toward this size over the years.
How far apart to plant False Indigo
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space False Indigo about 3 ft apart, center to center, so each plant has room to reach its full width.
Add False Indigo to a garden plan and the planner draws it at its full width, so you see the spacing before you buy.
Where these facts come from
False Indigo's height, spread, hardiness zones, sun, water, bloom months and color, years to mature size, trait tags, soil, diseases, pests and toxicity were checked against 20 published sources on August 25, 2026. Each one is linked below with every fact it carried, which can include a fact this page still marks as not yet checked, because a source carrying a value is not the same as the value being held to the standard. Facts not in that list, and the planting, spacing and size sections, are not covered by these sources.
- Internet Archive (archived page)Clemson Cooperative Extension Home and Garden Information Center, fact...height, spread, sun, water, bloom months and color, years to mature size, soil, diseases, pests and toxicity
- NC State Extensiongenus page: Baptisiaheight, spread, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- University of Illinois Extensiongenus featureheight, spread, sun, water, bloom months and color, years to mature size, trait tags, soil, diseases and pests
- University of Wisconsin HorticultureBaptisia australisheight, spread, hardiness zones, sun, water, bloom months and color, years to mature size, trait tags, soil and pests
- Lady Bird Johnson Wildflower CenterBaptisia australisheight, spread, sun, water, bloom months and color, trait tags, soil and toxicity
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, soil and diseases
- NC State ExtensionBaptisia australisheight, spread, hardiness zones, sun, trait tags, pests and toxicity
- University of Illinois ExtensionBaptisia australisheight, hardiness zones, sun, water, bloom months and color and trait tags
- Missouri Botanical GardenBaptisia australisheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical GardenBaptisia albaheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical GardenBaptisia sphaerocarpaheight, spread, hardiness zones, sun and trait tags
- Missouri Botanical GardenBaptisia tinctoriaheight, spread, hardiness zones, sun and trait tags
- NC State ExtensionBaptisia tinctoriaheight, spread, hardiness zones, sun and trait tags
- Walters GardensBaptisia australisheight, spread, hardiness zones, sun and trait tags
- Clemson Home and Garden Information Centergenus factsheetheight, spread, sun and trait tags
- Missouri Botanical GardenPlant Finderheight, hardiness zones and bloom months and color
- Missouri Botanical GardenPlant Finderspread, hardiness zones and bloom months and color
- Missouri Botanical GardenPlant Finderhardiness zones and bloom months and color
- Prairie Moon NurseryBaptisia australisheight, hardiness zones and sun
- NC State ExtensionPlant Toolboxheight and hardiness zones
How the checking works, and what each standard covers, is on the verified plants page.
Comes in 7 varieties across 4 colors
Same genus, similar care - pick the color you are growing.
- Carolina Moonlight
- Cherries Jubilee
- Dutch Chocolate
- Pink Lemonade
- Purple Smoke
- Screaming Yellow
- White Wild
Compare every variety in the False Indigo group
Every figure is the variety's own page fact. Tap a name to open it.
| Variety | Color | Blooms | Hardiness | Sun | Size (H × W) |
|---|---|---|---|---|---|
| Carolina Moonlight | Yellow | May–Jun | Zones 4–9 | Full sun | 4 ft × 3.5 ft |
| Cherries Jubilee | Red | May–Jun | Zones 4–8 | Full sun | 3 ft × 3 ft |
| Dutch Chocolate | Purple | May–Jun | Zones 4–9 | Full sun | 3 ft × 3 ft |
| Falsethis page | Blue | May–Jun | Zones 3–9 | Full sun | 3.5 ft × 3 ft |
| Pink Lemonade | Pink | May–Jun | Zones 4–9 | Full sun | 3.5 ft × 4 ft |
| Purple Smoke | Purple | May–Jun | Zones 4–9 | Full sun | 4 ft × 3.5 ft |
| Screaming Yellow | Yellow | May–Jun | Zones 5–8 | Full sun | 3 ft × 3 ft |
| White Wild | White | May–Jun | Zones 3–9 | Full sun | 3.5 ft × 3 ft |
Good to know about False Indigo
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note. A note reports what its source says; where that differs from a fact above, the fact above is this entry's stored value, and its mark says whether it has been checked.
Safety
Mildly toxic if eaten. All parts hold quinolizidine alkaloids; severity is low, with nausea, vomiting and diarrhea only if eaten in quantity. per NC State
Worth knowing
One deep taproot explains four traits at once: it makes the plant drought tolerant, long-lived for decades, slow to establish, and hard to move. Site it once. per NC State
Does it need staking?
Not fixed. Grown lean in full sun it stands on its own; it flops in shade, rich soil, or when overwatered. Fix the culture, not stakes. per NC State and Wisconsin
Soil pH and flowering
Sources split. Wisconsin says acidic soil hurts bloom and liming helps; NC State says pH is adaptable. Treat it as pH-flexible, lime only a strongly acidic bed. per Wisconsin and NC State
Butterfly host plant
Spring flowers feed bumblebees and butterflies, but its real value is as a larval host: several butterflies breed on it, including the Wild Indigo Duskywing. per NC State
Blue dye and rattles
The name recalls old uses: the blue flowers gave a dye once used in place of true indigo, and the rattling ripe seed pods became children's rattles. per NC State
Deer-proof and trouble-free
Its alkaloids make it highly deer resistant and nearly pest- and disease-free; the only regular visitor is a weevil that eats seed pods, not the plant. per NC State
What pairs well with False Indigo
Good companions share its growing conditions and add something it lacks: an earlier or later bloom, a lower carpet in front, or structure through winter.
Grape Hyacinth
Shares full sun and low water; blooms in early spring, before this one opens; lower at 8 in, for the front of the border; both offer pollinator forage, in different months.
Anise Hyssop
Shares full sun and low water; blooms in midsummer as this one finishes; both are strong pollinator plants, and they feed in different months; both are North American natives.
Crocus
Shares full sun and low water; blooms in late winter, before this one opens; low at 4 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Creeping Phlox
Shares full sun and low water; opens in mid spring and overlaps into this one's season; low at 6 in, to carpet the ground beneath; both are strong pollinator plants.
Hyacinth
Shares full sun and low to moderate water; blooms in early spring, before this one opens; lower at 10 in, for the front of the border; both offer pollinator forage, in different months.
Gazania
Shares full sun and low water; overlaps, then carries the display into early fall; lower at 10 in, for the front of the border; both offer pollinator forage.
Blazing Star
Shares full sun and low water; blooms in midsummer as this one finishes; both are strong pollinator plants, and they feed in different months; both are North American natives.
Potentilla
Shares full sun and low water; overlaps, then carries the display into early fall; both are strong pollinator plants; both are North American natives.
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