Cold hardiness & minimum temperature

Is Long-Horned Ginger Lily (Hedychium longicornutum)cold hardy? Hardiness zone & min temp

Also called long-horned ginger lily, hornbill's ginger, perched gingerwort, epiphytic ginger.

More about long-horned ginger lily

About Long-Horned Ginger Lily

Hedychium longicornutum · also called long-horned ginger lily, hornbill's ginger · tropical

Hedychium longicornutum is a highly unusual tropical epiphyte native to the rainforests of Peninsular Malaysia and southern Thailand, where it clasps tree branches with fleshy roots in lowland and hill forest. Its showy flowers are fiery orange-red with exceptionally long, thread-like corolla tubes — the feature that gives it the common name 'long-horned' — and it requires the warm, humid, free-draining conditions of an orchid rather than the soil culture of other ginger lilies. It is not frost-tolerant and must be grown under glass in temperate climates. The ASPCA lists closely related Hedychium species as non-toxic; long-horned ginger lily is considered non-toxic to cats and dogs.

Cold limit: USDA 11-12 (indoor in most climates) · RHS H1b (20–32°C (active growth); minimum 15°C at all times)

What long-horned ginger lily's hardiness rating actually means

Long-Horned Ginger Lily 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 H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 11-12 (indoor in most climates) — 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 about 10 °C (sustained cold below this is damaging). Long-Horned Ginger Lily has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for long-horned ginger lily as it gets too cold:

Below about about 10 °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 long-horned ginger lily go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °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 long-horned ginger lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Long-Horned Ginger Lily hardiness — frequently asked questions

Is long-horned ginger lily cold hardy?

Long-Horned Ginger Lily 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. Long-Horned Ginger Lily can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature long-horned ginger lily can survive?

What hardiness zone is long-horned ginger lily?

Long-Horned Ginger Lily is rated USDA 11-12 (indoor in most climates) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can long-horned ginger lily survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °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 long-horned ginger lily below its minimum temperature?

Below about about 10 °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.