Cold hardiness & minimum temperature

Is Garden's Clivia (Clivia gardenii)cold hardy? Hardiness zone & min temp

Also called Garden's Clivia, Major Garden's Clivia, Swamp Lily, Vlei Clivia.

More about garden's clivia

About Garden's Clivia

Clivia gardenii · also called Garden's Clivia, Major Garden's Clivia · houseplant

Clivia gardenii is an evergreen bulbous perennial endemic to moist, shaded areas along the eastern escarpment of KwaZulu-Natal and Mpumalanga, South Africa, often growing near streams and in vleis (wetlands). It bears slender, pendulous, tubular flowers in shades of orange to red with green petal tips, arranged in umbels of up to 60 florets, typically blooming in autumn. Its preference for slightly wetter conditions during the growing season distinguishes it from other Clivia species, yet it still requires a dry winter rest to initiate flowering. This plant is toxic to cats and dogs.

Cold limit: USDA 9a-11b (indoor in most climates) · RHS H1b (10–24°C (cool winter rest at 10–14°C))

Watch for — Root rot: The naturally wetter habitat of this species can mislead growers into overwatering year-round; maintain the winter dry rest and ensure excellent pot drainage to avoid root rot, which presents as yellowing leaves and mushy stems.

What garden's clivia's hardiness rating actually means

Garden's Clivia 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 9a-11b (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). Garden's Clivia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Garden's Clivia hardiness — frequently asked questions

Is garden's clivia cold hardy?

Garden's Clivia 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. Garden's Clivia can only live outside year-round in genuinely frost-free climates (roughly USDA 9a-11b (indoor in most climates)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature garden's clivia can survive?

What hardiness zone is garden's clivia?

Garden's Clivia is rated USDA 9a-11b (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 garden's clivia 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 garden's clivia 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.