Cold hardiness & minimum temperature

Is leatherleaf viburnum (Viburnum rhytidophyllum)cold hardy? Hardiness zone & min temp

Also called leatherleaf viburnum, rugose viburnum.

More about leatherleaf viburnum

About leatherleaf viburnum

Viburnum rhytidophyllum · also called leatherleaf viburnum, rugose viburnum · flowering

Leatherleaf viburnum is a large, semi-evergreen to evergreen shrub valued for its bold, deeply corrugated dark green leaves and flat-topped creamy flower clusters in late spring. Red berries ripen to black in autumn when cross-pollinated. Its large, architectural foliage provides substantial structure and year-round screening.

Cold limit: USDA 5-8 · RHS H6 (-20 to 30°C)

Watch for — Leaf drop in cold winters: Though broadly evergreen, foliage droops and may partially shed during harsh winters below -10°C, recovering in spring. This is normal semi-evergreen behavior rather than a sign of disease; no intervention needed.

What leatherleaf viburnum's hardiness rating actually means

Yes — leatherleaf viburnum is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 5-8 — 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 −20 to −15 °C. leatherleaf viburnum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for leatherleaf viburnum as it gets too cold:

It tolerates winter lows to about −20 to −15 °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 leatherleaf viburnum go outside or overwinter — and where?

Plant it out within USDA 5-8 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 leatherleaf viburnum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

leatherleaf viburnum hardiness — frequently asked questions

Is leatherleaf viburnum cold hardy?

Yes — leatherleaf viburnum is genuinely cold hardy. Rated RHS H6 and USDA 5-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. leatherleaf viburnum is hardy across USDA 5-8; 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 leatherleaf viburnum can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. leatherleaf viburnum is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is leatherleaf viburnum?

leatherleaf viburnum is rated USDA 5-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can leatherleaf viburnum survive winter outside?

Plant it out within USDA 5-8 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 leatherleaf viburnum below its minimum temperature?

It tolerates winter lows to about −20 to −15 °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.