Cold hardiness & minimum temperature

Is African Violet 'Optimara EverFloris' (Saintpaulia 'Optimara EverFloris')cold hardy? Hardiness zone & min temp

Also called EverFloris African Violet.

More about african violet 'optimara everfloris'

About African Violet 'Optimara EverFloris'

Saintpaulia 'Optimara EverFloris' · also called EverFloris African Violet · flowering

The 'Optimara EverFloris' African violet is a vigorous, larger-than-standard cultivar bred for near-continuous bloom and bigger flowers and leaves. Forming a fuzzy-leaved rosette, it flowers reliably year-round in bright indirect light with consistent, lukewarm bottom-watering. It prefers warm, humid rooms and a light, airy mix. African violets are pet-safe, making it a worry-free flowering houseplant.

Cold limit: USDA 11-12 (grown as an indoor plant) · RHS H1b (18-27°C)

Watch for — Pale leaf rings or spots: Cold water or droplets on the fuzzy leaves cause bleached ring spots. Use room-temperature water and keep foliage dry.

What african violet 'optimara everfloris''s hardiness rating actually means

African Violet 'Optimara EverFloris' 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 (grown as an indoor plant) — 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). African Violet 'Optimara EverFloris' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

African Violet 'Optimara EverFloris' hardiness — frequently asked questions

Is african violet 'optimara everfloris' cold hardy?

African Violet 'Optimara EverFloris' 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. African Violet 'Optimara EverFloris' can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (grown as an indoor plant)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature african violet 'optimara everfloris' can survive?

What hardiness zone is african violet 'optimara everfloris'?

African Violet 'Optimara EverFloris' is rated USDA 11-12 (grown as an indoor plant) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can african violet 'optimara everfloris' 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 african violet 'optimara everfloris' 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.