Cold hardiness & minimum temperature

Is Three-leaved Lantana (Lantana trifolia)cold hardy? Hardiness zone & min temp

Also called Three-leaved Lantana, Lavender Popcorn Lantana, Popcorn Lantana, Shrub Verbena.

More about three-leaved lantana

About Three-leaved Lantana

Lantana trifolia · also called Three-leaved Lantana, Lavender Popcorn Lantana · flowering

Lantana trifolia is a tropical shrub native to Central and South America and Mexico, distinguished by leaves that grow in whorls of three and elongated clusters of small lavender flowers that ripen into distinctive popcorn-like spikes of purple berries. It grows vigorously in full sun and average, well-drained soil, tolerating heat and brief drought once established. Its ornamental berry spikes make it particularly attractive to birds and it is widely used in subtropical and tropical gardens. Toxic to cats, dogs, and horses.

Cold limit: USDA 10-11 · RHS H1a (15–35°C)

Watch for — Invasive spread: Birds disperse seeds from the ornamental berries; in warm, frost-free climates (Florida, Hawaii, Pacific islands) L. trifolia can escape cultivation and become invasive. Deadhead berry spikes before seeds ripen in sensitive regions.

What three-leaved lantana's hardiness rating actually means

Three-leaved Lantana is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 10-11 — the zones where it can be left outdoors year-round.

New to these scales? The USDA hardiness zone map explained covers how the zone numbers work, and you can find your own zone with the zone finder.

Minimum temperature — and what happens below it

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Three-leaved Lantana has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for three-leaved lantana as it gets too cold:

Below about above about 15 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can three-leaved lantana go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

Work back from your local frost dates with the frost-date calculator: the last spring frost and first autumn frost are what really decide when three-leaved lantana can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Three-leaved Lantana hardiness — frequently asked questions

Is three-leaved lantana cold hardy?

Three-leaved Lantana is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Three-leaved Lantana can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature three-leaved lantana can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Three-leaved Lantana has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is three-leaved lantana?

Three-leaved Lantana is rated USDA 10-11 and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can three-leaved lantana survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to three-leaved lantana below its minimum temperature?

Below about above about 15 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.