Illustration
Diabolo
Physocarpus opulifolius 'Monlo'
Diabolo blooms from May through June.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Diabolo
Plant it in full sun. It prefers moderate water. It is hardy in USDA zones 3–7. Expect it to reach about 8 ft tall and 8 ft wide at maturity, in roughly 4 years (not yet checked).
No toxicity note is on file for Diabolo. 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 Diabolo
Plant Diabolo 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 May 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 Diabolo get?
8 fttall5 ft 7 inan adult8 ftwideSee Diabolo 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 Diabolo
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Diabolo about 8 ft of clear ground in every direction, measured from its center. It is one plant with room around it, not a row, and a raised bed is too small for it.
Add Diabolo 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
Diabolo's height, spread, hardiness zones, sun and trait tags were checked against 14 published sources on August 1, 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.
- plants.gertens.comGertens (NetPS Plant Finder database)height, spread, hardiness zones, sun, years to mature size and trait tags
- Missouri Botanical GardenPlant Finderheight, spread, hardiness zones, sun and trait tags
- nvknurseries.comNVK Nurseriesheight, spread, hardiness zones, sun and trait tags
- Clemson Home and Garden Information CenterClemson Cooperative Extension Home and Garden Information Centerheight, spread, sun and trait tags
- NC State ExtensionPlant Toolboxhardiness zones, sun, years to mature size and trait tags
- Oregon State UniversityLandscape Plantsheight, spread, hardiness zones and sun
- plantfinder.nativeplanttrust.orgNative Plant Trust Garden Plant Finderheight, spread, hardiness zones and trait tags
- Purdue ArboretumExplorerheight, spread, hardiness zones and sun
- RHSRoyal Horticultural Societyheight, spread, sun and years to mature size
- The Morton Arboretumheight, sun, years to mature size and trait tags
- Oregon State Universityspecies pagehardiness zones, sun and trait tags
- pridescorner.comPrides Corner Farmsheight, spread and hardiness zones
- University of Arkansas ExtensionUniversity of Arkansas Cooperative Extension Servicehardiness zones, sun and trait tags
- Iowa State University ExtensionYard and Gardenhardiness zones
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.