Cold hardiness & minimum temperature

Is Silverberry (Elaeagnus commutata)cold hardy? Hardiness zone & min temp

Also called Silverberry, Wolf-willow, American silverberry, Wild olive.

More about silverberry

About Silverberry

Elaeagnus commutata · also called Silverberry, Wolf-willow · flowering

Elaeagnus commutata is a deciduous, nitrogen-fixing shrub native to western and central North America, where it grows on dry, open slopes, riverbanks, and disturbed ground from Alaska to the northern US plains. It performs best in full sun and very well-drained, lean soils, and is among the hardiest shrubs in cultivation, thriving where temperatures drop to -40 °C. The most important care fact is that its suckering rhizomes spread vigorously, so site it where naturalising is welcome or install a root barrier. The ASPCA does not list this species as toxic to pets; the fruits are edible and the plant is considered non-toxic.

Cold limit: USDA 2-6 · RHS H7 (-40 to 35°C)

What silverberry's hardiness rating actually means

Yes — silverberry is genuinely cold hardy. Rated RHS H7 and USDA 2-6, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H7 means: Hardy in the severest European continental winters. On the US scale that maps to USDA 2-6 — 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 below about −20 °C. Silverberry is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for silverberry as it gets too cold:

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

Plant it out within USDA 2-6 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 silverberry can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Silverberry hardiness — frequently asked questions

Is silverberry cold hardy?

Yes — silverberry is genuinely cold hardy. Rated RHS H7 and USDA 2-6, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Silverberry is hardy across USDA 2-6; 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 silverberry can survive?

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

What hardiness zone is silverberry?

Silverberry is rated USDA 2-6 and RHS H7 — Hardy in the severest European continental winters.

Can silverberry survive winter outside?

Plant it out within USDA 2-6 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 silverberry below its minimum temperature?

It tolerates winter lows to about −20 °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.