Cold hardiness & minimum temperature

Is Nymphaea 'Perry's Fire Opal' (Nymphaea 'Perry's Fire Opal')cold hardy? Hardiness zone & min temp

Also called Perry's Fire Opal Waterlily.

More about nymphaea 'perry's fire opal'

About Nymphaea 'Perry's Fire Opal'

Nymphaea 'Perry's Fire Opal' · also called Perry's Fire Opal Waterlily · flowering

Nymphaea 'Perry's Fire Opal' is a free-flowering hardy waterlily raised by Perry Slocum, bearing large, full, fragrant blooms in deep fuchsia-pink with golden stamens. Vigorous and reliable, it holds a long flowering season over medium green pads. Suits medium to large ponds. Needs full sun, still water 30-75 cm deep, and a heavy loam basket.

Cold limit: USDA 3-11 (hardy waterlily; rootstock overwinters below ice) · RHS H5 (15-30°C)

What nymphaea 'perry's fire opal''s hardiness rating actually means

Yes — nymphaea 'perry's fire opal' is genuinely cold hardy. Rated RHS H5 and USDA 3-11 (hardy waterlily; rootstock overwinters below ice), 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 3-11 (hardy waterlily; rootstock overwinters below ice) — 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. Nymphaea 'Perry's Fire Opal' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for nymphaea 'perry's fire opal' 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 nymphaea 'perry's fire opal' go outside or overwinter — and where?

Plant it out within USDA 3-11 (hardy waterlily; rootstock overwinters below ice) 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 nymphaea 'perry's fire opal' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Nymphaea 'Perry's Fire Opal' hardiness — frequently asked questions

Is nymphaea 'perry's fire opal' cold hardy?

Yes — nymphaea 'perry's fire opal' is genuinely cold hardy. Rated RHS H5 and USDA 3-11 (hardy waterlily; rootstock overwinters below ice), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Nymphaea 'Perry's Fire Opal' is hardy across USDA 3-11 (hardy waterlily; rootstock overwinters below ice); 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 nymphaea 'perry's fire opal' can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Nymphaea 'Perry's Fire Opal' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is nymphaea 'perry's fire opal'?

Nymphaea 'Perry's Fire Opal' is rated USDA 3-11 (hardy waterlily; rootstock overwinters below ice) and RHS H5 — Hardy in most of the UK and in cold winters.

Can nymphaea 'perry's fire opal' survive winter outside?

Plant it out within USDA 3-11 (hardy waterlily; rootstock overwinters below ice) 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 nymphaea 'perry's fire opal' 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.