Cold hardiness & minimum temperature

Is Nymphaea 'Director George T. Moore' (Nymphaea 'Director George T. Moore')cold hardy? Hardiness zone & min temp

Also called Tropical Blue Waterlily.

More about nymphaea 'director george t. moore'

About Nymphaea 'Director George T. Moore'

Nymphaea 'Director George T. Moore' · also called Tropical Blue Waterlily · flowering

Nymphaea 'Director George T. Moore' is a celebrated tropical day-blooming waterlily with intense deep violet-blue flowers and a bright golden centre, held above the water on tall stalks. Heat-loving and floriferous, it is grown as a summer or glasshouse pond plant in the US and UK and must be overwintered frost-free.

Cold limit: USDA 9-11 (tender tropical; annual or overwinter frost-free in cooler zones) · RHS H1c (20-30°C)

Watch for — Frost damage and winter loss: Frost-tender; the crown dies if frozen. Lift the tuber before the first frost and overwinter it warm and just moist, or keep the plant in a heated conservatory pool.

What nymphaea 'director george t. moore''s hardiness rating actually means

Nymphaea 'Director George T. Moore' is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Its RHS rating of H1c means: Warm-temperate — can summer outdoors but must come in well before the first frost. On the US scale that maps to USDA 9-11 (tender tropical; annual or overwinter frost-free in cooler zones) — 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 5 °C (and never frost). Nymphaea 'Director George T. Moore' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for nymphaea 'director george t. moore' as it gets too cold:

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches.
A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover.
Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.

Can nymphaea 'director george t. moore' go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually.
Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C.
It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

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 'director george t. moore' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1c figure above.

Nymphaea 'Director George T. Moore' hardiness — frequently asked questions

Is nymphaea 'director george t. moore' cold hardy?

Nymphaea 'Director George T. Moore' is not cold hardy. It is a tropical houseplant that dies if it is left out through frost — there is no zone where it overwinters outdoors in a UK or cold-US climate. Indoor-only in almost every home. Nymphaea 'Director George T. Moore' can only live outside year-round in genuinely frost-free climates (roughly USDA 9-11 (tender tropical; annual or overwinter frost-free in cooler zones)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature nymphaea 'director george t. moore' can survive?

Minimum survivable temperature is roughly about 5 °C (and never frost). Nymphaea 'Director George T. Moore' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is nymphaea 'director george t. moore'?

Nymphaea 'Director George T. Moore' is rated USDA 9-11 (tender tropical; annual or overwinter frost-free in cooler zones) and RHS H1c — Warm-temperate — can summer outdoors but must come in well before the first frost.

Can nymphaea 'director george t. moore' survive winter outside?

It can holiday outdoors in summer once nights are reliably above 5 °C, in shade or dappled light, hardened off gradually. Bring it back indoors well before the first autumn frost — do not wait for a frost warning, move it when nights drop toward 10-12 °C. It will never overwinter outside in a temperate climate; the indoors is its winter home, full stop.

What happens to nymphaea 'director george t. moore' below its minimum temperature?

Below about about 5 °C, growth stalls and the leaves start to show cold stress — dark, water-soaked, or yellowing patches. A single light frost blackens the foliage; a hard freeze kills the whole plant, roots included, and it does not recover. Even a cold, draughty windowsill or an unheated porch in winter can be enough to damage it permanently.