Cold hardiness & minimum temperature

Is Yellow Marliac Water Lily (Nymphaea 'Marliacea Chromatella')cold hardy? Hardiness zone & min temp

Also called Yellow Marliac Water Lily, Chromatella Water Lily, Golden Cup Water Lily.

More about yellow marliac water lily

About Yellow Marliac Water Lily

Nymphaea 'Marliacea Chromatella' · also called Yellow Marliac Water Lily, Chromatella Water Lily · flowering

A classic hardy water lily cultivar bred by Joseph Bory Latour-Marliac in the late 19th century and holder of the RHS Award of Garden Merit, 'Marliacea Chromatella' produces soft canary-yellow flowers up to 15 cm across above attractively olive-mottled leaves. Reliably free-flowering, tolerant of partial shade, and fully frost-hardy — one of the most popular garden water lilies worldwide.

Cold limit: USDA 4–11 · RHS H7 (-10–35°C (active growth 15–28°C))

What yellow marliac water lily's hardiness rating actually means

Yes — yellow marliac water lily is genuinely cold hardy. Rated RHS H7 and USDA 4–11, 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 4–11 — 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. Yellow Marliac Water Lily is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for yellow marliac water lily 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 yellow marliac water lily go outside or overwinter — and where?

Plant it out within USDA 4–11 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 yellow marliac water lily can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H7 figure above.

Yellow Marliac Water Lily hardiness — frequently asked questions

Is yellow marliac water lily cold hardy?

Yes — yellow marliac water lily is genuinely cold hardy. Rated RHS H7 and USDA 4–11, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Yellow Marliac Water Lily is hardy across USDA 4–11; 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 yellow marliac water lily can survive?

Minimum survivable temperature is roughly below about −20 °C. Yellow Marliac Water Lily is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is yellow marliac water lily?

Yellow Marliac Water Lily is rated USDA 4–11 and RHS H7 — Hardy in the severest European continental winters.

Can yellow marliac water lily survive winter outside?

Plant it out within USDA 4–11 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 yellow marliac water lily 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.