Allamanda
Sources last read 14 September 2026.
Not yet rated How forgiving it is has not been judged here yet.
Also called Golden Trumpet Vine, Golden-Trumpet and Yellow Allamanda.
Allamanda is toxic
- Not assessed for cats. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
- Not assessed for dogs. This plant is not on the ASPCA list. That is not a finding of safety: none of the sources read for this site gives an answer either way. Treat it as unknown.
- Toxic to people. Harmful when eaten; irritates skin and eyes. Use gloves and protective gear when handling it. RHS
What the sources say about its care
- Light
- Full sunRHS · read 13 September 2026
- Water
- Moist but well-drainedRHS · read 13 September 2026
- Humidity
No source read publishes a humidity figure for any plant on this site. What follows is general guidance for foliage plants.
ASHRAE recommends indoor relative humidity between 30% and 60% 30–60%Penn State Extension · read 13 September 2026- Temperature
How cold this tolerates, not what it prefers. No source read for this site publishes a preferred range for a plant indoors.
H1B — 10–15°C 10–15 °CRHS · read 13 September 2026- Soil
- Loam, Sand; pH Acid or NeutralRHS · read 13 September 2026
- Toxic to cats
- Not on the ASPCA list. That is not a finding of safety.ASPCA · read 13 September 2026
- Toxic to dogs
- Not on the ASPCA list. That is not a finding of safety.ASPCA · read 13 September 2026
- Harmful to people
- Harmful when eaten; irritates skin and eyes. Use gloves and protective gear when handling it.RHS · read 13 September 2026
Routine care
- Propagation
- Stem cuttingsNC State Extension · read 13 September 2026Increase from seed or greenwood cuttings.RHS · read 13 September 2026
- Pruning
- Either pruning group 11 or 12.RHS · read 13 September 2026
- Pests and diseases
- Can be troubled by glasshouse whitefly and glasshouse red spider mite. Diseases: usually none.RHS · read 13 September 2026
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About the plant
Allamanda cathartica, commonly called golden trumpet, common trumpetvine, and yellow allamanda, is a species of flowering plant in the family Apocynaceae. It is native to Bolivia, Brazil, French Guiana, Guyana, Suriname, and Venezuela, and widely naturalised elsewhere in the tropics. This plant is cited in Flora Brasiliensis by Carl Friedrich Philipp von Martius.
From Wikipedia, CC BY-SA 4.0 · read 13 September 2026
- Native range
- N. South America to N. BoliviaWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026Tropical America, and BrazilNC State Extension · read 13 September 2026
- Climate
- wet tropicalWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026
- Growth form
- scrambling shrub or treeWorld Checklist of Vascular Plants, June 2026 release, CC BY.Kew WCVP · read 13 September 2026Herbaceous Perennial, Perennial, Shrub, Vine; habit climbing, creeping, spreadingNC State Extension · read 13 September 2026Climbing (evergreen)RHS · read 13 September 2026
- Size
- Height 72–96 inNC State Extension · read 13 September 2026Height 8-12 metres; spread 2.5-4 metres after 10–20 yearsRHS · read 13 September 2026
- Flowering
- Flowers gold/yellow; blooms in fall, summerNC State Extension · read 13 September 2026Flowers yellow in summer and autumnRHS · read 13 September 2026
- Uses
What sources record people using this plant for. A traditional or medicinal use listed here is a record of use, not advice to eat it or treat anything with it.
Traditional medicine uses the leaves and roots as a laxative and to induce vomiting, but big doses are toxic.NC State Extension · read 13 September 2026
More of the Apocynaceae family
HoyaDry scorched spots after a move into a sunnier spot
Madagascar periwinkleBrown, papery patches on the leaves nearest the glass
OleanderBrown brittle margins with a green centre
String of heartsNew leaves arrive smaller and paler than the ones below
African Starfish FlowerSourced care, difficulty not yet judged
Black BellsSourced care, difficulty not yet judged
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Sources
- ASPCA · read 13 September 2026
- Kew WCVP · read 13 September 2026
- NC State Extension · read 13 September 2026
- Penn State Extension · read 13 September 2026
- RHS · read 13 September 2026
- Wikipedia · read 13 September 2026
What this does not cover
The figures above are what published sources say, not measurements of the plant in your room. They say nothing about your pot size, your water, the season, or how far from the glass the plant stands, and those decide more than any figure here does.
Humidity has no species figure because no source read for this site publishes one, and the only temperature published for this plant is a cold floor. The simulator fills those gaps with general figures for its kind of plant, marked as general and listed on how we read sources. Where a toxicity row says the plant was not assessed, that is the absence of a finding and not a finding of safety.
If something is already wrong, the diagnosis tool asks about the soil, the window and the watering, which is where the answer usually is.