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False Indigo
Baptisia
False Indigo blooms from May through June.
Mature size, hardiness zones, sun and the trait tags were checked against named botanical sources for this plant. The bloom months and water need on this page were not.
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 3.3 ft tall and 3 ft wide at maturity, in roughly 3 years.
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. For the middle of its hardy zones 3 to 9 range, 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: for the middle of its range, start with zone 6 in March.
Comes in 7 varieties across 4 colors
Same plant, same care - pick the color you are growing.
Good to know about False Indigo
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
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; echoes the blue.
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; orange against blue, for contrast.
Portulaca
Shares full sun and low water; overlaps, then carries the display into early fall; low at 6 in, to carpet the ground beneath; orange against blue, for contrast.
Crocus
Shares full sun and low water; blooms in late winter, before this one opens; low at 4 in, to carpet the ground beneath; purple sits close to blue on the wheel.
Siberian Squill
Shares full sun and low to moderate water; blooms in early spring, before this one opens; low at 6 in, to carpet the ground beneath; echoes the blue.
Ice Plant
Shares full sun and low water; overlaps, then carries the display into early fall; low at 4 in, to carpet the ground beneath.
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 native plants.
Basket of Gold
Shares full sun and low water; opens in mid spring and overlaps into this one's season; lower at 8 in, for the front of the border.
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