Cold hardiness & minimum temperature

Is Black-eyed Susan 'Goldsturm' (Rudbeckia fulgida)cold hardy? Hardiness zone & min temp

Also called Black-eyed Susan, Goldsturm Coneflower, Orange Coneflower.

More about black-eyed susan 'goldsturm'

About Black-eyed Susan 'Goldsturm'

Rudbeckia fulgida · also called Black-eyed Susan, Goldsturm Coneflower · flowering

Black-eyed Susan 'Goldsturm' is one of the most reliable garden perennials, producing an incredibly prolific display of deep golden-yellow daisies with dark chocolate-brown central cones from midsummer to autumn. It is drought-tolerant once established and attracts pollinators and birds. Mildly toxic to pets.

Cold limit: USDA 3-9 · RHS H7 (-30 to 35°C)

What black-eyed susan 'goldsturm''s hardiness rating actually means

Yes — black-eyed susan 'goldsturm' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, 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 3-9 — 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. Black-eyed Susan 'Goldsturm' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for black-eyed susan 'goldsturm' 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 black-eyed susan 'goldsturm' go outside or overwinter — and where?

Plant it out within USDA 3-9 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 black-eyed susan 'goldsturm' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Black-eyed Susan 'Goldsturm' hardiness — frequently asked questions

Is black-eyed susan 'goldsturm' cold hardy?

Yes — black-eyed susan 'goldsturm' is genuinely cold hardy. Rated RHS H7 and USDA 3-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Black-eyed Susan 'Goldsturm' is hardy across USDA 3-9; 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 black-eyed susan 'goldsturm' can survive?

Minimum survivable temperature is roughly below about −20 °C. Black-eyed Susan 'Goldsturm' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is black-eyed susan 'goldsturm'?

Black-eyed Susan 'Goldsturm' is rated USDA 3-9 and RHS H7 — Hardy in the severest European continental winters.

Can black-eyed susan 'goldsturm' survive winter outside?

Plant it out within USDA 3-9 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 black-eyed susan 'goldsturm' 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.