Cold hardiness & minimum temperature

Is Hypoestes phyllostachya 'Splash Select White' (Hypoestes phyllostachya 'Splash Select White')cold hardy? Hardiness zone & min temp

Also called White splash hypoestes, White splash polka dot.

More about hypoestes phyllostachya 'splash select white'

About Hypoestes phyllostachya 'Splash Select White'

Hypoestes phyllostachya 'Splash Select White' · also called White splash hypoestes, White splash polka dot · tropical

Hypoestes phyllostachya 'Splash Select White' is a uniform polka dot plant from the Splash Select series, its green leaves boldly overlaid with large white splashes for high contrast. This Madagascan soft-stemmed tropical wants warmth, bright indirect light, and steady moisture to hold its variegation. Bred for consistency and bushiness, it stays tidy with pinching and roots fast from cuttings.

Cold limit: USDA 10-11 (indoor in most US and UK homes) · RHS H1b (18-27°C)

Watch for — Wilting or dropping leaves: Typically from the soil drying out completely or from cold draughts. Keep evenly moist and away from cold windows and hot air vents.

What hypoestes phyllostachya 'splash select white''s hardiness rating actually means

Hypoestes phyllostachya 'Splash Select White' 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 10-11 (indoor in most US and UK homes) — 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). Hypoestes phyllostachya 'Splash Select White' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for hypoestes phyllostachya 'splash select white' 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 hypoestes phyllostachya 'splash select white' 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 hypoestes phyllostachya 'splash select white' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Hypoestes phyllostachya 'Splash Select White' hardiness — frequently asked questions

Is hypoestes phyllostachya 'splash select white' cold hardy?

Hypoestes phyllostachya 'Splash Select White' 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. Hypoestes phyllostachya 'Splash Select White' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-11 (indoor in most US and UK homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature hypoestes phyllostachya 'splash select white' can survive?

What hardiness zone is hypoestes phyllostachya 'splash select white'?

Hypoestes phyllostachya 'Splash Select White' is rated USDA 10-11 (indoor in most US and UK homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can hypoestes phyllostachya 'splash select white' 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 hypoestes phyllostachya 'splash select white' 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.