Cold hardiness & minimum temperature

Is Elymaitic Rosularia (Rosularia elymaitica)cold hardy? Hardiness zone & min temp

Also called Elymaitic Rosularia.

More about elymaitic rosularia

About Elymaitic Rosularia

Rosularia elymaitica · also called Elymaitic Rosularia · houseplant

A compact rosette-forming succulent native to the rocky mountain slopes of western Iran (Zagros region). It produces tight clusters of fleshy leaves and delicate pink to white summer flowers. Grown indoors, treat it like an alpine succulent: gritty drainage, bright light, and restrained watering to mimic its arid, stony homeland.

Cold limit: USDA 5–9 · RHS H5 (5–27°C)

Watch for — Root rot from overwatering: The most frequent cause of death. Ensure the soil dries between waterings and that pots drain freely. Reduce water to near-zero in winter.

What elymaitic rosularia's hardiness rating actually means

Yes — elymaitic rosularia is genuinely cold hardy. Rated RHS H5 and USDA 5–9, 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 5–9 — 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. Elymaitic Rosularia is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for elymaitic 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 elymaitic rosularia go outside or overwinter — and where?

Plant it out within USDA 5–9 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 elymaitic rosularia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Elymaitic Rosularia hardiness — frequently asked questions

Is elymaitic rosularia cold hardy?

Yes — elymaitic rosularia is genuinely cold hardy. Rated RHS H5 and USDA 5–9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Elymaitic Rosularia is hardy across USDA 5–9; 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 elymaitic rosularia can survive?

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

What hardiness zone is elymaitic rosularia?

Elymaitic Rosularia is rated USDA 5–9 and RHS H5 — Hardy in most of the UK and in cold winters.

Can elymaitic rosularia survive winter outside?

Plant it out within USDA 5–9 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 elymaitic 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.