Cold hardiness & minimum temperature

Is Turkish Rosularia (Rosularia muratdaghensis)cold hardy? Hardiness zone & min temp

Also called Turkish Rosularia, Murat Dagh Rosularia.

More about turkish rosularia

About Turkish Rosularia

Rosularia muratdaghensis · also called Turkish Rosularia, Murat Dagh Rosularia · houseplant

Rosularia muratdaghensis is a rare Turkish endemic Crassulaceae succulent from Mount Murat Dağı, forming low, compact rosettes of fleshy, often glandular leaves. Like other Rosularia species, it produces small, star-shaped flowers in summer. It thrives in full sun with excellent drainage and suits alpine troughs, rockeries, and bright indoor windowsills.

Cold limit: USDA 6–9 · RHS H5 (-5–28°C)

What turkish rosularia's hardiness rating actually means

Yes — turkish rosularia is genuinely cold hardy. Rated RHS H5 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 6–9 — 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 −15 to −10 °C. Turkish Rosularia is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for turkish rosularia as it gets too cold:

It tolerates winter lows to about −15 to −10 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can turkish rosularia go outside or overwinter — and where?

Plant it out within USDA 6–9 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 turkish rosularia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Turkish Rosularia hardiness — frequently asked questions

Is turkish rosularia cold hardy?

Yes — turkish rosularia is genuinely cold hardy. Rated RHS H5 and USDA 6–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Turkish Rosularia is hardy across USDA 6–9; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature turkish rosularia can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Turkish Rosularia is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is turkish rosularia?

Turkish Rosularia is rated USDA 6–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can turkish rosularia survive winter outside?

Plant it out within USDA 6–9 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to turkish rosularia below its minimum temperature?

It tolerates winter lows to about −15 to −10 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.