Illustration
Tranquilite Clematis
Clematis 'Evipo111'
Also called tranquilite, tranquilité and boulevard tranquilite clematis
Also comes in white.
Tranquilite Clematis blooms from May through September.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Tranquilite Clematis
Plant it in part shade. It prefers moderate water. It is hardy in USDA zones 4–9. Expect it to reach about 4.5 ft tall and 2.5 ft wide at maturity, in roughly 3 years (a house reading).
Is Tranquilite Clematis toxic to dogs or cats?
- Listed as toxic to dogs and cats by NC State Extension.
- Listed as poisonous to people by NC State Extension.
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
Mature height and spread, hardiness zones, sun, water, bloom months and color and the trait tags were checked against named botanical sources for this plant, with what the sources could not settle written down; years to mature size rests on a recorded house rule where no publisher states one, and is marked so; its common name and alternate names have not been checked yet. 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 Tranquilite Clematis
Plant Tranquilite Clematis 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 9, spring means March to May and fall means August or September. Once settled, it blooms from May to September.
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 Tranquilite Clematis get?
4.5 fttall5 ft 7 inan adult2.5 ftwideSee Tranquilite Clematis 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 Tranquilite Clematis
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Tranquilite Clematis about 2.5 ft apart, center to center, so each plant has room to reach its full width.
Add Tranquilite Clematis 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
Tranquilite Clematis' height, spread, hardiness zones, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity were checked against 10 published sources on October 12, 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.
- RHSRoyal Horticultural Societyheight, spread, sun, water, bloom months and color, trait tags, soil, diseases, pests and toxicity
- Plant Addictsheight, spread, hardiness zones, sun, water, bloom months and color, trait tags and pests
- NC State Extensiongenus pagesun, water, soil, diseases, pests and toxicity
- Perennials.com (Heritage Perennials)Valleybrook International Ventures Inc.height, spread, hardiness zones, sun and bloom months and color
- raymondevisonclematis.comRaymond Evison Clematis (Guernsey Clematis Nursery, the breeder)height, hardiness zones, sun, bloom months and color and trait tags
- pridescorner.comPrides Corner Farms (Connecticut wholesale grower)height, spread, hardiness zones, sun and water
- clematisontheweb.orgClematis on the Web (International Clematis Society database)height, hardiness zones and bloom months and color
- donahuesclematis.comDonahue's Clematis (Faribault, Minnesota), 2025 Pruning Guideheight, bloom months and color and trait tags
- hoogeveenplants.nlHoogeveen Plants (Hazerswoude-Dorp, Netherlands), European introducer...height and bloom months and color
- RHSInternational Clematis Register and Checklist 2002, Seventh Supplementheight and bloom months and color
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.