Cold hardiness & minimum temperature

Is Maudiae-Type Slipper 'Black Jack' (Paphiopedilum Maudiae 'Black Jack')cold hardy? Hardiness zone & min temp

Also called Vinicolor Slipper Orchid.

More about maudiae-type slipper 'black jack'

About Maudiae-Type Slipper 'Black Jack'

Paphiopedilum Maudiae 'Black Jack' · also called Vinicolor Slipper Orchid · flowering

Paphiopedilum Maudiae 'Black Jack' is a vinicolor Maudiae-type slipper hybrid grown for its near-black, wine-red flower and beautifully tessellated, mottled foliage. Compact, warmth-tolerant and reliably free-flowering, it is one of the easiest slipper orchids for the home. Like all Paphiopedilum it lacks pseudobulbs and must stay evenly moist.

Cold limit: USDA 10-12 (indoors in most US homes) · RHS H1b (16-27°C)

Watch for — Sheath or bud blast: Sudden swings in temperature, humidity or watering can abort developing buds. Keep conditions steady while a spike is forming.

What maudiae-type slipper 'black jack''s hardiness rating actually means

Maudiae-Type Slipper 'Black Jack' 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 H1b means: Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season. On the US scale that maps to USDA 10-12 (indoors in most US homes) — 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 10 °C (sustained cold below this is damaging). Maudiae-Type Slipper 'Black Jack' has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for maudiae-type slipper 'black jack' as it gets too cold:

Below about about 10 °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 maudiae-type slipper 'black jack' go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above 10 °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 maudiae-type slipper 'black jack' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Maudiae-Type Slipper 'Black Jack' hardiness — frequently asked questions

Is maudiae-type slipper 'black jack' cold hardy?

Maudiae-Type Slipper 'Black Jack' 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. Maudiae-Type Slipper 'Black Jack' can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoors in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature maudiae-type slipper 'black jack' can survive?

What hardiness zone is maudiae-type slipper 'black jack'?

Maudiae-Type Slipper 'Black Jack' is rated USDA 10-12 (indoors in most US homes) and RHS H1b — Sub-tropical — a normal warm home is fine, but it cannot go outside in a cool season.

Can maudiae-type slipper 'black jack' survive winter outside?

It can holiday outdoors in summer once nights are reliably above 10 °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 maudiae-type slipper 'black jack' below its minimum temperature?

Below about about 10 °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.