Cold hardiness & minimum temperature

Is Marcgravia sintenisii (Marcgravia sintenisii)cold hardy? Hardiness zone & min temp

Also called Sintenisii Marcgravia, Collector Shingle Plant.

More about marcgravia sintenisii

About Marcgravia sintenisii

Marcgravia sintenisii · also called Sintenisii Marcgravia, Collector Shingle Plant · houseplant

Marcgravia sintenisii is a sought-after collector's shingle vine prized for tidy, overlapping juvenile leaves often flushed with red on new growth. Like its relatives it is a terrarium plant demanding high humidity, warmth and indirect light. Grown on damp cork or a moss pole in an enclosed setup, it slowly carpets the surface in flat, ornamental foliage.

Cold limit: USDA 11-12 (indoor/terrarium only in the US and UK) · RHS H1a (20-28°C)

What marcgravia sintenisii's hardiness rating actually means

Marcgravia sintenisii 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 H1a means: Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever. On the US scale that maps to USDA 11-12 (indoor/terrarium only in the US and UK) — 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 above about 15 °C (warm, never cold). Marcgravia sintenisii has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for marcgravia sintenisii as it gets too cold:

Below about above about 15 °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 marcgravia sintenisii go outside or overwinter — and where?

It can holiday outdoors in summer once nights are reliably above above 15 °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 marcgravia sintenisii can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1a figure above.

Marcgravia sintenisii hardiness — frequently asked questions

Is marcgravia sintenisii cold hardy?

Marcgravia sintenisii 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. Marcgravia sintenisii can only live outside year-round in genuinely frost-free climates (roughly USDA 11-12 (indoor/terrarium only in the US and UK)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature marcgravia sintenisii can survive?

Minimum survivable temperature is roughly above about 15 °C (warm, never cold). Marcgravia sintenisii has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

What hardiness zone is marcgravia sintenisii?

Marcgravia sintenisii is rated USDA 11-12 (indoor/terrarium only in the US and UK) and RHS H1a — Tropical — needs a heated room or greenhouse; no frost tolerance whatsoever.

Can marcgravia sintenisii survive winter outside?

It can holiday outdoors in summer once nights are reliably above above 15 °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 marcgravia sintenisii below its minimum temperature?

Below about above about 15 °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.