Cold hardiness & minimum temperature

Is Ugni (Ugni molinae)cold hardy? Hardiness zone & min temp

Also called Chilean guava, Ugni, Murta.

More about ugni

About Ugni

Ugni molinae · also called Chilean guava, Ugni · tropical

Ugni, the Chilean guava, is a compact evergreen shrub bearing small aromatic red berries with a strawberry-like flavour. Hardier than most subtropical fruit, it tolerates light frost and suits sheltered gardens or pots. It likes full sun to part shade, moist but well-drained acidic soil and shelter from cold winds, and forms a neat, slow-growing bush ideal for hedging.

Cold limit: USDA 8-10 · RHS H4 (5-25°C)

Watch for — Poor fruiting: Too much shade or cold, dull summers reduce berry set; site in full sun in a sheltered, warm position.

What ugni's hardiness rating actually means

Yes — ugni 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. Ugni is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for ugni 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 ugni 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 ugni can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Ugni hardiness — frequently asked questions

Is ugni cold hardy?

Yes — ugni 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. Ugni 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 ugni can survive?

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

What hardiness zone is ugni?

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

Can ugni 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 ugni 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.