Cold hardiness & minimum temperature

Is Waras' Parodia (Parodia warasii)cold hardy? Hardiness zone & min temp

Also called Waras' Parodia, Waras' Ball Cactus.

More about waras' parodia

About Waras' Parodia

Parodia warasii · also called Waras' Parodia, Waras' Ball Cactus · houseplant

Waras' Parodia is a rare, globose to short-columnar cactus from southern Brazil, notable for its dense white to yellowish spination and bright yellow flowers produced in summer. It is a compact, slow-growing species suited to windowsill collections. Like most Parodia, it is more tolerant of light watering than many other cacti and rewards careful, moderate care with reliable flowering.

Cold limit: USDA 10-11 · RHS H1c (5–35°C)

Watch for — Failure to flower: Insufficient light and skipping a cool, dry winter rest are the main causes. Ensure bright light and a cool dry winter period (around 10°C/50°F) for 6–8 weeks to trigger spring flower bud formation.

What waras' parodia's hardiness rating actually means

Waras' Parodia 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 H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. 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 about 5 °C (and never frost). Waras' Parodia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for waras' parodia as it gets too cold:

Below about about 5 °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 waras' parodia go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °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 waras' parodia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Waras' Parodia hardiness — frequently asked questions

Is waras' parodia cold hardy?

Waras' Parodia 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. Waras' Parodia 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 waras' parodia can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Waras' Parodia has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is waras' parodia?

Waras' Parodia is rated USDA 10-11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can waras' parodia survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °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 waras' parodia below its minimum temperature?

Below about about 5 °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.