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Goatsbeard
Aruncus dioicus
Goatsbeard blooms from June through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Goatsbeard
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 3–7. Expect it to reach about 4 ft tall and 3.5 ft wide at maturity, in roughly 3 years (not yet checked).
What was checked
Mature height and spread, 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, and each fact above says which. 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 Goatsbeard
Plant Goatsbeard 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 5, the middle of its hardy zones 3 to 7, spring means April to June and fall means August or September. Once settled, it blooms from June to July.
Month-by-month timing for your zone is on the planting calendar; if you garden near zone 5, the middle of this plant's hardy range, start with zone 5 in April. Derived from the plant's category, zones and bloom months plus typical zone frost dates, not checked separately.
How big does Goatsbeard get?
4 fttall5 ft 7 inan adult3.5 ftwideSee Goatsbeard 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 Goatsbeard
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Goatsbeard about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add Goatsbeard 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
Goatsbeard's height, spread, hardiness zones, sun and trait tags were checked against 11 published sources on July 31, 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.
- kb.jniplants.comJohnson's Nursery Knowledgebaseheight, spread, hardiness zones, sun, years to mature size and trait tags
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun, years to mature size and trait tags
- NC State ExtensionPlant Toolboxheight, spread, hardiness zones, sun, years to mature size and trait tags
- prairienursery.comPrairie Nurseryheight, hardiness zones, sun, years to mature size and trait tags
- sugarcreekgardens.comSugar Creek Gardensheight, spread, hardiness zones, sun and trait tags
- University of Arkansas ExtensionUniversity of Arkansas Cooperative Extension Serviceheight, spread, hardiness zones, sun and trait tags
- University of Wisconsin HorticultureUniversity of Wisconsin-Madison Division of Extension, Wisconsin Horti...hardiness zones, sun, years to mature size and trait tags
- Lady Bird Johnson Wildflower Centerheight, sun and trait tags
- Missouri Department of ConservationField Guideheight, sun and trait tags
- tnyards.utk.eduUniversity of Tennessee Institute of Agriculture, Tennessee Smart Yardsheight, sun and trait tags
- tripplebrookfarm.comTripple Brook Farmheight and hardiness zones
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Goatsbeard
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.
Worth knowing
Male and female plants are separate, and the males are showier: their plumes are fuller and last about four weeks longer, so buy male plants for the best show. per NC State and Arkansas
Are the seeds toxic?
The plant is regarded non-toxic to people and pets, but one source calls the ripe seed capsules on female plants poisonous, so keep that seed away from children. per NC State and Wisconsin
Zone range varies by source
Sources give 3 to 7, 3 to 8, or 4 to 8. The cold end is reliably 3; heat and humidity, not cold, limit the warm end. per NC State and Missouri Botanical
Looks like a giant astilbe
Reads like a shrub-sized giant astilbe: mounds of ferny, divided foliage topped by large, feathery plumes of tiny creamy-white flowers held well above the leaves. per NC State
Moisture controls sun tolerance
Moisture controls how much sun it can take: it tolerates full sun in the cool north only if kept constantly wet, and needs more shade in the hot south. per NC State and Wisconsin
Host for a native butterfly
A North American native and the larval host for the Dusky Azure butterfly (Celastrina nigra); the plumes also feed bees, butterflies and moths. per NC State and Wildflower Center
Hard to move once established
Long-lived but slow: give it 2 to 3 seasons to reach full size. Established plants are very hard to transplant, so pick the spot and leave it. per Wisconsin and NC State
What pairs well with Goatsbeard
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.
Primrose
Shares part shade and moderate 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.
Flowering Dogwood
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; taller at 23 ft, for the layer behind it.
Snowdrop
Shares part shade and moderate water; blooms in late winter, before this one opens; low at 5 in, to carpet the ground beneath; both offer pollinator forage, in different months.
Azalea
Shares part shade and moderate water; blooms in mid spring, before this one opens; both offer pollinator forage, in different months; evergreen, so the bed keeps its shape through winter.
Hellebore
Shares part shade and moderate water; blooms in late winter, before this one opens; evergreen, so the bed keeps its shape through winter; lower at 1.5 ft, for the front of the border.
Japanese Anemone
Shares part shade and moderate water; blooms in late summer as this one finishes; both offer pollinator forage, in different months; lower at 3 ft, for the front of the border.
Lobelia
Takes part sun to part shade and moderate water; lower at 8 in, for the front of the border; overlaps, then carries the display into early fall; both offer pollinator forage.
Pansy
Takes part sun to part shade and moderate water; opens in early spring and overlaps into this one's season; lower at 8 in, for the front of the border; a soft color beside the white.
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Drop this plant onto a 3D plan, see how it fills in, and watch your whole garden bloom across the year.