Cold hardiness & minimum temperature

Is Gaillardia 'Arizona Sun' (Gaillardia x grandiflora 'Arizona Sun')cold hardy? Hardiness zone & min temp

Also called Arizona Sun blanket flower.

More about gaillardia 'arizona sun'

About Gaillardia 'Arizona Sun'

Gaillardia x grandiflora 'Arizona Sun' · also called Arizona Sun blanket flower · flowering

Gaillardia 'Arizona Sun' is an award-winning compact blanket flower bearing large mahogany-red daisies edged in bright yellow from early summer until frost. Bred for uniform, fast flowering from seed, it loves full sun and dry, well-drained soil, tolerates heat and drought, and is a magnet for bees and butterflies.

Cold limit: USDA 3-10 · RHS H5 (15-30°C)

Watch for — Crown / root rot: The commonest killer, caused by wet or rich soil. Plant in fast-draining ground and avoid winter wet to keep plants alive.

What gaillardia 'arizona sun''s hardiness rating actually means

Yes — gaillardia 'arizona sun' is genuinely cold hardy. Rated RHS H5 and USDA 3-10, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 3-10 — 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 −15 to −10 °C. Gaillardia 'Arizona Sun' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for gaillardia 'arizona sun' as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 gaillardia 'arizona sun' go outside or overwinter — and where?

Plant it out within USDA 3-10 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 gaillardia 'arizona sun' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Gaillardia 'Arizona Sun' hardiness — frequently asked questions

Is gaillardia 'arizona sun' cold hardy?

Yes — gaillardia 'arizona sun' is genuinely cold hardy. Rated RHS H5 and USDA 3-10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Gaillardia 'Arizona Sun' is hardy across USDA 3-10; 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 gaillardia 'arizona sun' can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Gaillardia 'Arizona Sun' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is gaillardia 'arizona sun'?

Gaillardia 'Arizona Sun' is rated USDA 3-10 and RHS H5 — Hardy in most of the UK and in cold winters.

Can gaillardia 'arizona sun' survive winter outside?

Plant it out within USDA 3-10 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 gaillardia 'arizona sun' below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.