Cold hardiness & minimum temperature

Is Cymbidium 'Showgirl' (Cymbidium 'Showgirl')cold hardy? Hardiness zone & min temp

Also called Showgirl Cymbidium.

More about cymbidium 'showgirl'

About Cymbidium 'Showgirl'

Cymbidium 'Showgirl' · also called Showgirl Cymbidium · flowering

Cymbidium 'Showgirl' is a popular older hybrid grown for its profuse, long-lasting sprays of soft pink flowers with a lightly spotted lip in winter and spring. It is compact, vigorous, and easy to flower, making it a reliable beginner cymbidium. It rewards bright light, generous summer watering, and a cool autumn rest with abundant blooms.

Cold limit: USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) · RHS H2 (10-24°C)

Watch for — Bud blast: Sudden swings in temperature or humidity, or moving the plant after budding. Keep conditions steady from spike to open bloom.

What cymbidium 'showgirl''s hardiness rating actually means

Cymbidium 'Showgirl' is half-hardy (RHS H2). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Its RHS rating of H2 means: Tender — survives a frost-free greenhouse or a very mild, sheltered spot. On the US scale that maps to USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) — 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 1 to 5 °C — tolerates cold but no real frost. Cymbidium 'Showgirl' shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for cymbidium 'showgirl' as it gets too cold:

Down to roughly about 1 to 5 °C it copes, especially if dry and sheltered.
A sustained hard frost collapses the top growth; whether it returns depends on whether the roots, crown or tubers froze.
Wet cold is far more lethal than dry cold for this plant — soggy, frozen soil is the usual killer.

Can cymbidium 'showgirl' go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) or a frost-free UK microclimate.
In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter.
A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

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 cymbidium 'showgirl' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H2 figure above.

Frost protection for borderline cymbidium 'showgirl'

Cymbidium 'Showgirl' is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost.
Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse.
Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones.
Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.

Cymbidium 'Showgirl' hardiness — frequently asked questions

Is cymbidium 'showgirl' cold hardy?

Cymbidium 'Showgirl' is half-hardy (RHS H2). It survives a mild winter outdoors in a sheltered spot, but a hard frost kills it — so in colder zones it is lifted, potted, or grown as a tender plant. Borderline outdoors. In its mild end of USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) (and sheltered UK gardens) cymbidium 'showgirl' can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature cymbidium 'showgirl' can survive?

Minimum survivable temperature is roughly about 1 to 5 °C — tolerates cold but no real frost. Cymbidium 'Showgirl' shrugs off cold nights but a real, sustained freeze will kill it.

What hardiness zone is cymbidium 'showgirl'?

Cymbidium 'Showgirl' is rated USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can cymbidium 'showgirl' survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-10 (indoor or cool greenhouse in most US homes; outdoors in summer where climate is mild) or a frost-free UK microclimate. In colder zones, grow it in a pot you can move under cover, or lift its tubers/roots and store them frost-free over winter. A south-facing wall, free-draining soil and a dry winter position can push it a full zone hardier than the books suggest.

How do I protect cymbidium 'showgirl' from frost?

Mulch the crown or root zone deeply with bark, straw or leaf-mould before the first hard frost. Move container plants against a warm wall or into an unheated but frost-free porch or greenhouse. Fleece the top growth on the coldest nights, and keep it on the dry side — dry roots survive cold far better than wet ones. Lift dahlia-type tubers or tender crowns after the first light frost blackens the foliage and store them somewhere cool but frost-free.