Cold hardiness & minimum temperature

Is Envy Green Zinnia (Zinnia elegans)cold hardy? Hardiness zone & min temp

Also called Envy Zinnia, Green Zinnia, Common Zinnia.

More about envy green zinnia

About Envy Green Zinnia

Zinnia elegans · also called Envy Zinnia, Green Zinnia · flowering

A novelty cut-flower zinnia bearing unusual lime-green double blooms on tall 60–75 cm stems. Grown as a warm-season annual in full sun, it provides striking contrast in bouquets and borders. Highly sought by florists. Not listed as toxic by the ASPCA; considered non-toxic to pets.

Cold limit: USDA Annual in all zones (summer annual zones 2–11) · RHS H1C (frost-tender annual) (18–35°C)

What envy green zinnia's hardiness rating actually means

Yes — envy green zinnia is genuinely cold hardy. Rated RHS H7 and USDA Annual in all zones (summer annual zones 2–11), 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 (summer annual zones 2–11) — 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. Envy Green Zinnia is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for envy green zinnia 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 envy green zinnia go outside or overwinter — and where?

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

Envy Green Zinnia hardiness — frequently asked questions

Is envy green zinnia cold hardy?

Yes — envy green zinnia is genuinely cold hardy. Rated RHS H7 and USDA Annual in all zones (summer annual zones 2–11), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Envy Green Zinnia is hardy across USDA Annual in all zones (summer annual zones 2–11); 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 envy green zinnia can survive?

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

What hardiness zone is envy green zinnia?

Envy Green Zinnia is rated USDA Annual in all zones (summer annual zones 2–11) and RHS H7 — Hardy in the severest European continental winters.

Can envy green zinnia survive winter outside?

Plant it out within USDA Annual in all zones (summer annual zones 2–11) 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 envy green zinnia 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.