Cold hardiness & minimum temperature

Is Double Click Cranberries Cosmos (Cosmos bipinnatus)cold hardy? Hardiness zone & min temp

Also called Double Click Cosmos, Cranberry Cosmos, Double Cosmos.

More about double click cranberries cosmos

About Double Click Cranberries Cosmos

Cosmos bipinnatus · also called Double Click Cosmos, Cranberry Cosmos · flowering

A select Cosmos bipinnatus cultivar producing fully double and semi-double blooms in deep cranberry-pink on tall 90–110 cm stems ideal for cutting. Feathery foliage adds lightness to arrangements. Easy to grow in full sun with average soil. Non-toxic to pets per ASPCA listings for the species.

Cold limit: USDA Annual in all zones (zones 2–11 as summer annual) · RHS H1C (frost-tender annual) (16–30°C)

What double click cranberries cosmos's hardiness rating actually means

Yes — double click cranberries cosmos is genuinely cold hardy. Rated RHS H7 and USDA Annual in all zones (zones 2–11 as summer annual), 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 Annual in all zones (zones 2–11 as summer annual) — 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. Double Click Cranberries Cosmos is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for double click cranberries cosmos 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 double click cranberries cosmos go outside or overwinter — and where?

Plant it out within USDA Annual in all zones (zones 2–11 as summer annual) 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 double click cranberries cosmos can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Double Click Cranberries Cosmos hardiness — frequently asked questions

Is double click cranberries cosmos cold hardy?

Yes — double click cranberries cosmos is genuinely cold hardy. Rated RHS H7 and USDA Annual in all zones (zones 2–11 as summer annual), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Double Click Cranberries Cosmos is hardy across USDA Annual in all zones (zones 2–11 as summer annual); 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 double click cranberries cosmos can survive?

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

What hardiness zone is double click cranberries cosmos?

Double Click Cranberries Cosmos is rated USDA Annual in all zones (zones 2–11 as summer annual) and RHS H7 — Hardy in the severest European continental winters.

Can double click cranberries cosmos survive winter outside?

Plant it out within USDA Annual in all zones (zones 2–11 as summer annual) 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 double click cranberries cosmos 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.