Cold hardiness & minimum temperature

Is Lawes' Dendrobium (Dendrobium lawesii)cold hardy? Hardiness zone & min temp

Also called Lawes' Cane Orchid.

More about lawes' dendrobium

About Lawes' Dendrobium

Dendrobium lawesii · also called Lawes' Cane Orchid · tropical

Dendrobium lawesii is a pendulous warm-growing epiphytic orchid from Papua New Guinea and the Solomon Islands, bearing brilliant red and white tubular flowers in clusters along hanging canes. It is best displayed in a hanging basket to showcase its drooping growth. Orchidaceae are non-toxic to pets per the ASPCA.

Cold limit: USDA 11-12 (indoor only) · RHS H1A (18-30°C)

Watch for — Failure to flower: Skipping the dry winter rest is the most common cause. Ensure a firm 6-8 week rest with minimal watering and cooler nights.

What lawes' dendrobium's hardiness rating actually means

Lawes' Dendrobium 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 only) — 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). Lawes' Dendrobium has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for lawes' dendrobium 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 lawes' dendrobium 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 lawes' dendrobium can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Lawes' Dendrobium hardiness — frequently asked questions

Is lawes' dendrobium cold hardy?

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

What is the minimum temperature lawes' dendrobium can survive?

What hardiness zone is lawes' dendrobium?

Lawes' Dendrobium is rated USDA 11-12 (indoor only) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can lawes' dendrobium 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 lawes' dendrobium 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.