Cold hardiness & minimum temperature

Is Roborowsky's Sage (Salvia roborowskii)cold hardy? Hardiness zone & min temp

Also called Roborowsky's sage.

More about roborowsky's sage

About Roborowsky's Sage

Salvia roborowskii · also called Roborowsky's sage · flowering

Salvia roborowskii is an annual or biennial herb native to a wide area encompassing Tibet, Sikkim, and five provinces in China, where it grows on wet stream banks, hillside grasslands, and disturbed ground at elevations of 2,400–3,600 m. It produces erect, much-branched, sticky-hairy stems to 90 cm bearing whorls of small lemon-yellow flowers. As an annual or biennial, it must be resown each season in most temperate gardens; it is not frost-hardy enough to overwinter reliably outdoors in the UK or most of North America. The ASPCA lists sage (Salvia) as non-toxic to cats and dogs.

Cold limit: USDA 7-9 (grown as an annual in cooler zones) · RHS H3 (5°C to 30°C)

What roborowsky's sage's hardiness rating actually means

Hardiness works differently for roborowsky's sage: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". Its RHS rating of H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 7-9 (grown as an annual in cooler zones) — 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

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for roborowsky's sage as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can roborowsky's sage go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

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 roborowsky's sage can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline roborowsky's sage

Roborowsky's Sage is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Roborowsky's Sage hardiness — frequently asked questions

Is roborowsky's sage cold hardy?

Hardiness works differently for roborowsky's sage: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Roborowsky's Sage is grown 7-9 (grown as an annual in cooler zones); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature roborowsky's sage can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is roborowsky's sage?

Roborowsky's Sage is rated USDA 7-9 (grown as an annual in cooler zones) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can roborowsky's sage survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect roborowsky's sage from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.