Cold hardiness & minimum temperature

Is Nandina Obsessed (Nandina domestica 'Seika')cold hardy? Hardiness zone & min temp

Also called Obsessed Nandina, Compact Nandina.

More about nandina obsessed

About Nandina Obsessed

Nandina domestica 'Seika' · also called Obsessed Nandina, Compact Nandina · flowering

'Obsessed' (cultivar 'Seika') is a compact nandina with a vivid colour cycle: new growth flushes brilliant scarlet-red, matures to deep green, then re-flushes red with each new spring and autumn cycle. Denser and more refined than the species, it makes a bright, low-maintenance evergreen accent or hedge in sunny mild-climate gardens.

Cold limit: USDA 6-9 (outdoor landscape shrub) · RHS H4 (-15 to 35°C)

Watch for — Leaf scorch in winter: Cold, drying winds can brown leaf edges in exposed sites. Provide shelter and ensure plants are watered going into freezing weather.

What nandina obsessed's hardiness rating actually means

Yes — nandina obsessed is genuinely cold hardy. Rated RHS H4 and USDA 6-9 (outdoor landscape shrub), 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 6-9 (outdoor landscape 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 −10 to −5 °C. Nandina Obsessed is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for nandina obsessed 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 nandina obsessed go outside or overwinter — and where?

Plant it out within USDA 6-9 (outdoor landscape 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 nandina obsessed can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H4 figure above.

Nandina Obsessed hardiness — frequently asked questions

Is nandina obsessed cold hardy?

Yes — nandina obsessed is genuinely cold hardy. Rated RHS H4 and USDA 6-9 (outdoor landscape shrub), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Nandina Obsessed is hardy across USDA 6-9 (outdoor landscape 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 nandina obsessed can survive?

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

What hardiness zone is nandina obsessed?

Nandina Obsessed is rated USDA 6-9 (outdoor landscape shrub) and RHS H4 — Hardy in an average winter across much of the temperate world.

Can nandina obsessed survive winter outside?

Plant it out within USDA 6-9 (outdoor landscape 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.

What happens to nandina obsessed 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.