Illustration
Royal Purple
Cotinus coggygria 'Royal Purple'
Royal Purple blooms from June through July.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Royal Purple
Plant it in full sun. It prefers low water. It is hardy in USDA zones 4–8. Expect it to reach about 11 ft tall and 10 ft wide at maturity, in roughly 5 years (a house reading).
Pets
- Not yet checked for pets.
Lists differ and none is complete. If a pet eats a plant and seems unwell, call a veterinarian or a pet poison helpline.
What was checked
Nine facts were checked against named botanical sources, each recorded beside the sources that carried it: mature height and spread, hardiness zones, sun, water, bloom months and color, the trait tags, and years to mature size, which rests on a recorded house rule where no publisher states one and is marked so. Soil, diseases, pests, toxicity and the plant's own names have not yet been read for this plant, and its trait tags are the ones a feature uses rather than every word a page prints. 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 Royal Purple
Plant Royal Purple 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 4 to 8, spring means March to May 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 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 Royal Purple get?
11 fttall5 ft 7 inan adult10 ftwideSee Royal Purple 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 Royal Purple
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Give Royal Purple about 10 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 Royal Purple 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
Royal Purple's height, spread, hardiness zones, sun, water, bloom months and color and trait tags were checked against 8 published sources on October 20, 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 Gardenheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- NC State Extensionheight, spread, hardiness zones, sun, water, bloom months and color and trait tags
- nvknurseries.comNVK Nurseriesheight, spread, sun, water, bloom months and color and trait tags
- spotswoodgreenery.comSpotswood Greeneryheight, spread, hardiness zones, sun, water and bloom months and color
- Chicago Botanic Gardenheight, spread, hardiness zones, sun and bloom months and color
- provendernurseries.co.ukProvender Nurseriesheight, spread, sun, water and bloom months and color
- RHSRoyal Horticultural Societyheight, sun, water, bloom months and color and trait tags
- University of Illinois Extensionsun and trait tags
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Royal Purple
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Related to poison ivy; contact with the resinous sap may cause contact dermatitis, especially in people already sensitive to poison ivy. Wear gloves when pruning. per NC State
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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.