Illustration
Brunner 'Silver Heart'
Brunnera macrophylla 'Silver Heart'
Brunner 'Silver Heart' blooms from April through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Brunner 'Silver Heart'
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 3–8. Expect it to reach about 18 in tall and 24 in wide at maturity, in roughly 2 years (not yet checked).
No toxicity note is on file for Brunner 'Silver Heart'. That is not a clearance: check its safety for people and pets before planting.
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 Brunner 'Silver Heart'
Plant Brunner 'Silver Heart' 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 8, spring means April to June and fall means August or September. Once settled, it blooms from April to June.
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 Brunner 'Silver Heart' get?
18 intall5 ft 7 inan adult24 inwideSee Brunner 'Silver Heart' 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 Brunner 'Silver Heart'
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Brunner 'Silver Heart' about 24 in apart, center to center, so each plant has room to reach its full width.
Add Brunner 'Silver Heart' 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
Brunner 'Silver Heart''s height, spread, hardiness zones, sun and trait tags were checked against 8 published sources on July 29, 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.
- northwestblooms.comNorthwest Bloomsheight, spread, hardiness zones, sun and trait tags
- Pleasant Run Nurseryheight, spread, hardiness zones, sun and trait tags
- wilsonbrosgardens.comWilson Bros Gardensheight, spread, hardiness zones, sun and trait tags
- Iowa State University Extensionand Outreach, Yard and Gardenheight, spread, sun and trait tags
- NC State Extensionspecies pagehardiness zones, sun and trait tags
- RHSRoyal Horticultural Societyheight, spread and sun
- Chicago Botanic GardenPlant Finderhardiness zones and sun
- Missouri Botanical Gardenspecies pagehardiness zones and sun
How the checking works, and what each standard covers, is on the verified plants page.
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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.