Cold hardiness & minimum temperature

Is Aucuba japonica Crotonifolia (Aucuba japonica 'Crotonifolia')cold hardy? Hardiness zone & min temp

Also called Crotonifolia Aucuba, Gold Dust Plant.

More about aucuba japonica crotonifolia

About Aucuba japonica Crotonifolia

Aucuba japonica 'Crotonifolia' · also called Crotonifolia Aucuba, Gold Dust Plant · flowering

Aucuba japonica 'Crotonifolia' is a tough, shade-tolerant evergreen shrub with large glossy leaves heavily speckled gold, earning it the name gold dust plant. A male, AGM-winning clone, it brightens deep, dry, and polluted shade where little else thrives. Hardy and low-maintenance, it suits shaded borders, hedging, urban gardens, and large containers, including cool indoor positions.

Cold limit: USDA 7-10 (outdoor shrub) · RHS H5 (-10 to 26°C)

Watch for — Leaf blackening: Black blotches or whole-leaf blackening follow frost damage, scorching sun, or waterlogging; site in sheltered shade with good drainage.

What aucuba japonica crotonifolia's hardiness rating actually means

Yes — aucuba japonica crotonifolia is genuinely cold hardy. Rated RHS H5 and USDA 7-10 (outdoor shrub), 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 7-10 (outdoor shrub) — 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. Aucuba japonica Crotonifolia is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for aucuba japonica crotonifolia 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 aucuba japonica crotonifolia go outside or overwinter — and where?

Plant it out within USDA 7-10 (outdoor shrub) 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 aucuba japonica crotonifolia can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Frost protection for borderline aucuba japonica crotonifolia

Aucuba japonica Crotonifolia is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes.
Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness.
Shelter new growth from late spring frosts with fleece if a hard night is forecast.

Aucuba japonica Crotonifolia hardiness — frequently asked questions

Is aucuba japonica crotonifolia cold hardy?

Yes — aucuba japonica crotonifolia is genuinely cold hardy. Rated RHS H5 and USDA 7-10 (outdoor shrub), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Aucuba japonica Crotonifolia is hardy across USDA 7-10 (outdoor shrub); 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 aucuba japonica crotonifolia can survive?

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

What hardiness zone is aucuba japonica crotonifolia?

Aucuba japonica Crotonifolia is rated USDA 7-10 (outdoor shrub) and RHS H5 — Hardy in most of the UK and in cold winters.

Can aucuba japonica crotonifolia survive winter outside?

Plant it out within USDA 7-10 (outdoor shrub) 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.

How do I protect aucuba japonica crotonifolia from frost?

At the cold edge of its range, mulch the root zone in late autumn to buffer the deepest freezes. Protect container specimens — pots freeze through far faster than open ground, costing roughly a zone of hardiness. Shelter new growth from late spring frosts with fleece if a hard night is forecast.