Cold hardiness & minimum temperature

Is White-Leaved Rock Rose (Cistus albidus)cold hardy? Hardiness zone & min temp

Also called White-leaved rock rose, White-leaf cistus, Grey-leaved cistus.

More about white-leaved rock rose

About White-Leaved Rock Rose

Cistus albidus · also called White-leaved rock rose, White-leaf cistus · flowering

Cistus albidus is a compact evergreen shrub native to the western Mediterranean — Spain, Portugal, southern France, and North Africa — where it colonises dry, rocky hillsides and garrigue. It is grown for its distinctive white-felted, grey-green leaves and bowl-shaped lilac-pink flowers with yellow stamens, produced prolifically in early summer. Full sun and sharply draining, low-fertility soil are essential; this species is remarkably drought-tolerant once established and resents wet winters far more than cold. Cistus is not listed by the ASPCA as toxic, and no toxic principles are documented for the genus.

Cold limit: USDA 8-10 · RHS H4 (-10–35°C)

Watch for — Root rot in wet or clay soils: The number one killer of Cistus albidus in the UK; poorly drained winter soil causes rapid root death. Plant on a raised bed or add grit to improve drainage, and choose a sheltered south- or west-facing position.

What white-leaved rock rose's hardiness rating actually means

Yes — white-leaved rock rose is genuinely cold hardy. Rated RHS H4 and USDA 8-10, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H4 means: Hardy in an average winter across much of the temperate world. On the US scale that maps to USDA 8-10 — 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 −10 to −5 °C. White-Leaved Rock Rose is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for white-leaved rock rose as it gets too cold:

It tolerates winter lows to about −10 to −5 °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 white-leaved rock rose go outside or overwinter — and where?

Plant it out within USDA 8-10 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 white-leaved rock rose can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

White-Leaved Rock Rose hardiness — frequently asked questions

Is white-leaved rock rose cold hardy?

Yes — white-leaved rock rose is genuinely cold hardy. Rated RHS H4 and USDA 8-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. White-Leaved Rock Rose is hardy across USDA 8-10; 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 white-leaved rock rose can survive?

Minimum survivable temperature is roughly about −10 to −5 °C. White-Leaved Rock Rose is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is white-leaved rock rose?

White-Leaved Rock Rose is rated USDA 8-10 and RHS H4 — Hardy in an average winter across much of the temperate world.

Can white-leaved rock rose survive winter outside?

Plant it out within USDA 8-10 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 white-leaved rock rose below its minimum temperature?

It tolerates winter lows to about −10 to −5 °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.