Cold hardiness & minimum temperature

Is Crimson-Spot Rock Rose (Cistus ladanifer)cold hardy? Hardiness zone & min temp

Also called Crimson-spot rock rose, Gum rockrose, Common gum cistus, Labdanum cistus.

More about crimson-spot rock rose

About Crimson-Spot Rock Rose

Cistus ladanifer · also called Crimson-spot rock rose, Gum rockrose · flowering

Cistus ladanifer is a tall, aromatic evergreen shrub native to the western Mediterranean — Portugal, Spain, Morocco, and Algeria — where it dominates open scrubland and fire-prone garrigue. It is one of the most distinctive Cistus species, prized for its very large white flowers (up to 8 cm across), each petal bearing a bold crimson-maroon blotch at its base, and for its sticky, intensely aromatic leaves that produce the resin labdanum, used historically in perfumery. It requires full sun, sharply drained soil, and a sheltered site; it dislikes alkaline soils as it matures and will not regenerate from hard pruning. No toxic principles are documented for the Cistus genus.

Cold limit: USDA 8-10 · RHS H4 (-10–38°C)

What crimson-spot rock rose's hardiness rating actually means

Yes — crimson-spot 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. Crimson-Spot Rock Rose is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for crimson-spot 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 crimson-spot 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 crimson-spot 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.

Crimson-Spot Rock Rose hardiness — frequently asked questions

Is crimson-spot rock rose cold hardy?

Yes — crimson-spot 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. Crimson-Spot 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 crimson-spot rock rose can survive?

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

What hardiness zone is crimson-spot rock rose?

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

Can crimson-spot 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 crimson-spot 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.