Cold hardiness & minimum temperature

Is Chiric Sanango (Brunfelsia grandiflora)cold hardy? Hardiness zone & min temp

Also called Chiric Sanango, Yesterday-Today-and-Tomorrow, Morning-Noon-and-Night.

More about chiric sanango

About Chiric Sanango

Brunfelsia grandiflora · also called Chiric Sanango, Yesterday-Today-and-Tomorrow · tropical

Brunfelsia grandiflora is a Peruvian rainforest shrub prized for fragrant tubular flowers that open deep purple, fade to lavender, then white over three days. In frost-free climates it blooms nearly year-round in dappled light. Indoors it needs bright indirect light, consistent moisture, and high humidity to perform well. All parts are poisonous.

Cold limit: USDA 10-12 · RHS H1b (16-30°C)

Watch for — Bud drop: Caused by sudden temperature drops, draughts, low humidity, or moving the plant while buds are forming. Maintain a stable environment of 18-24°C and 60%+ humidity; avoid repositioning once flower buds appear.

What chiric sanango's hardiness rating actually means

Chiric Sanango 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 10-12 — 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). Chiric Sanango has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Chiric Sanango hardiness — frequently asked questions

Is chiric sanango cold hardy?

Chiric Sanango 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. Chiric Sanango can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature chiric sanango can survive?

What hardiness zone is chiric sanango?

Chiric Sanango is rated USDA 10-12 and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can chiric sanango 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 chiric sanango 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.