Cold hardiness & minimum temperature

Is Lance-leaf Stelis (Stelis lanceola)cold hardy? Hardiness zone & min temp

Also called Lance-leaf Stelis.

More about lance-leaf stelis

About Lance-leaf Stelis

Stelis lanceola · also called Lance-leaf Stelis · tropical

Lance-leaf Stelis is distinguished by its narrow, lance-shaped leaves and successive small flowers on slender racemes. Originating in Neotropical cloud forests, it grows as a compact epiphyte thriving in cool, humid, well-ventilated conditions. Moderately challenging to cultivate, it rewards growers who can replicate consistent moisture, high humidity, and cool temperatures year-round.

Cold limit: USDA 11-12 · RHS H1b (10–23°C)

Watch for — Sparse flowering: Without a mild cool and slightly drier winter rest (10–13°C nights for 6–8 weeks), lance-leaf Stelis may produce vegetative growth but fail to initiate blooms. Simulate a seasonal shift to trigger flowering.

What lance-leaf stelis's hardiness rating actually means

Lance-leaf Stelis 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 — 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). Lance-leaf Stelis has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for lance-leaf stelis 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 lance-leaf stelis 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 lance-leaf stelis can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Lance-leaf Stelis hardiness — frequently asked questions

Is lance-leaf stelis cold hardy?

Lance-leaf Stelis 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. Lance-leaf Stelis can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature lance-leaf stelis can survive?

What hardiness zone is lance-leaf stelis?

Lance-leaf Stelis is rated USDA 11-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can lance-leaf stelis 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 lance-leaf stelis 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.