Cold hardiness & minimum temperature

Is Orange Woolly Sage (Salvia confertiflora)cold hardy? Hardiness zone & min temp

Also called Orange woolly sage, Red velvet sage, Sabra spike sage.

More about orange woolly sage

About Orange Woolly Sage

Salvia confertiflora · also called Orange woolly sage, Red velvet sage · tropical

Salvia confertiflora is a large, striking tender shrub from Brazil, grown for its long, densely packed spikes of scarlet-orange tubular flowers with deep red calyces that appear in late summer and autumn, and for its strongly aromatic, scalloped, felted yellow-green leaves that can reach 20 cm in length. In the UK it is treated as a half-hardy perennial — overwintered frost-free under glass and moved outdoors in summer — or grown as a tender annual. The RHS rates it H1c (minimum 5°C). Salvia species are not listed as toxic to cats or dogs by the ASPCA.

Cold limit: USDA 9–11 · RHS H1c (5–30°C)

Watch for — Powdery mildew and root rot: Poor air circulation under glass leads to powdery mildew; overwatering in winter causes Phytophthora root rot. Ensure good ventilation, reduce winter watering, and use free-draining compost.

What orange woolly sage's hardiness rating actually means

Orange Woolly Sage 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 — 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). Orange Woolly Sage has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

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

Orange Woolly Sage hardiness — frequently asked questions

Is orange woolly sage cold hardy?

Orange Woolly Sage 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. Orange Woolly Sage can only live outside year-round in genuinely frost-free climates (roughly USDA 9–11); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature orange woolly sage can survive?

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

What hardiness zone is orange woolly sage?

Orange Woolly Sage is rated USDA 9–11 and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can orange woolly sage 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 orange woolly sage 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.