Cold hardiness & minimum temperature

Is Lavender Chirita (Chirita lavandulacea)cold hardy? Hardiness zone & min temp

Also called Lavender Chirita, Lavender Microchirita.

More about lavender chirita

About Lavender Chirita

Chirita lavandulacea · also called Lavender Chirita, Lavender Microchirita · houseplant

Lavender Chirita is a charming annual gesneriad from the Malay Peninsula, growing to 50 cm with soft hairy elliptic leaves and a generous display of pale lavender, white-throated tubular flowers in summer and autumn. Unlike most gesneriads it dies after setting seed, but self-sows freely. It holds an RHS Award of Garden Merit and suits a warm, bright windowsill.

Cold limit: USDA 10–12 · RHS H1c (15–28°C)

Watch for — Short lifespan confusion: As a true annual, plants die after setting seed — this is normal, not a care failure. Collect seed from dried capsules and sow the following late winter under glass at 19–24°C to maintain the plant year to year.

What lavender chirita's hardiness rating actually means

Lavender Chirita 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 10–12 — 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 5 °C (and never frost). Lavender Chirita has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for lavender chirita 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 lavender chirita 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 lavender chirita can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Lavender Chirita hardiness — frequently asked questions

Is lavender chirita cold hardy?

Lavender Chirita 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. Lavender Chirita 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 lavender chirita can survive?

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

What hardiness zone is lavender chirita?

Lavender Chirita is rated USDA 10–12 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can lavender chirita 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 lavender chirita 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.