Illustration
Crimson Rambler
Ipomoea purpurea 'Crimson Rambler'
Crimson Rambler blooms from June through October.
Months here are Northern Hemisphere months; in the Southern Hemisphere, shift them by six months.
Growing Crimson Rambler
Plant it in full sun. It prefers moderate water. Expect it to reach about 10 ft tall and 3.5 ft wide at maturity, in roughly 1 year (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.
How big does Crimson Rambler get?
10 fttall5 ft 7 inan adult3.5 ftwideSee Crimson Rambler 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 Crimson Rambler
Derived from the mature spread above by a fixed rule, not checked separately: spacing is the spread, center to center.
Space Crimson Rambler about 3.5 ft apart, center to center, so each plant has room to reach its full width.
Add Crimson Rambler 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
Crimson Rambler'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.
- selectseeds.comSelect Seedsheight, spread, sun and trait tags
- dianeseeds.comDiane's Flower Seedsheight, sun and trait tags
- Missouri Botanical Gardenspecies page, zones and sun onlyhardiness zones, sun and trait tags
- NC State Extensionspecies page, zones and sun onlyhardiness zones, sun and trait tags
- Outsideprideheight, hardiness zones and sun
- ufseeds.comUrban Farmer Seedsheight, sun and trait tags
- jmgvines.comJacksonville Morning Glory Vineyard (specialist grower's cultivar reco...height
- nijssenbulbs.comPeter C. Nijssen (Nijssen Bulbs)height
How the checking works, and what each standard covers, is on the verified plants page.
Good to know about Crimson Rambler
Curated from university extensions, botanic gardens and other primary sources, with the source named on every note.
Safety
Toxic to dogs, cats and horses. The seeds are the most dangerous part: they carry ergoline (LSA) alkaloids that are poisonous and hallucinogenic if eaten. per ASPCA and NC State
Explore similar plants
You might also like
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.