Illustration
Screaming Yellow
Baptisia sphaerocarpa 'Screaming Yellow'
Screaming Yellow blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Screaming Yellow
Plant it in full sun. It prefers low water. It is hardy in USDA zones 5–8. Expect it to reach about 3 ft tall and 3 ft wide at maturity, in roughly 3 years (a house reading).
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 Screaming Yellow
Plant Screaming Yellow 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 5 to 8, 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 Screaming Yellow get?
3 fttall5 ft 7 inan adult3 ftwideSee Screaming Yellow 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 Screaming Yellow
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Screaming Yellow about 3 ft apart, center to center, so each plant has room to reach its full width.
Add Screaming Yellow 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
Screaming Yellow's height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 10 published sources on August 24, 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.
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil and diseases
- Clemson Home and Garden Information CenterHGIC 1184height, spread, sun, water, trait tags, soil, diseases, pests and toxicity
- Chicago Botanic GardenPlant Finderheight, hardiness zones, sun, bloom months and color and soil
- grownative.orgGrow Native!, Missouri Prairie Foundationheight, spread, sun, water, soil and pests
- NC State ExtensionPlant Toolboxsun, water, soil, diseases, pests and toxicity
- Missouri Botanical GardenPlant Finderspread, hardiness zones and bloom months and color
- Plant Delights Nurseryheight, sun, water and pests
- Lady Bird Johnson Wildflower Centerbloom months and color
- Mt. Cuba CenterTrial Gardenbloom months and color
- Mt. Cuba CenterTrial Gardensoil
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Screaming Yellow
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
Explore similar plants
You might also like
Foliage
Design a garden with this
Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.