Cold hardiness & minimum temperature

Is Strobilanthes auriculata var. dyeriana (Strobilanthes auriculata var. dyeriana)cold hardy? Hardiness zone & min temp

Also called Royal purple plant, Persian shield.

More about strobilanthes auriculata var. dyeriana

About Strobilanthes auriculata var. dyeriana

Strobilanthes auriculata var. dyeriana · also called Royal purple plant, Persian shield · tropical

Persian shield is a tropical Southeast Asian sub-shrub grown for iridescent purple-silver lance-shaped leaves veined in dark green. It thrives in warm, humid bright-indirect light and rich, evenly moist soil. Foliage colour intensifies with light but scorches in harsh sun. Often treated as an annual or houseplant outside the tropics, refreshed yearly from easy cuttings.

Cold limit: USDA 9-11 (grown as annual or houseplant elsewhere) · RHS H1c (18-27°C)

Watch for — Crispy brown leaf edges: Low humidity or dry drafts scorch the margins. Raise humidity with a pebble tray or humidifier and keep away from radiators and heating vents.

What strobilanthes auriculata var. dyeriana's hardiness rating actually means

Strobilanthes auriculata var. dyeriana 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 9-11 (grown as annual or houseplant elsewhere) — 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). Strobilanthes auriculata var. dyeriana has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Strobilanthes auriculata var. dyeriana hardiness — frequently asked questions

Is strobilanthes auriculata var. dyeriana cold hardy?

Strobilanthes auriculata var. dyeriana 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. Strobilanthes auriculata var. dyeriana can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (grown as annual or houseplant elsewhere)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature strobilanthes auriculata var. dyeriana can survive?

What hardiness zone is strobilanthes auriculata var. dyeriana?

Strobilanthes auriculata var. dyeriana is rated USDA 9-11 (grown as annual or houseplant elsewhere) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can strobilanthes auriculata var. dyeriana 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 strobilanthes auriculata var. dyeriana 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.