Cold hardiness & minimum temperature

Is Heartleaf philodendron (Philodendron hederaceum)cold hardy? Hardiness zone & min temp

Also called heart-leaf philodendron, sweetheart vine, vining philodendron.

About Heartleaf philodendron

Philodendron hederaceum · also called heart-leaf philodendron, sweetheart vine · tropical

Heartleaf philodendron is the classic trailing green philodendron, near-indestructible and tolerant of low light. Pothos-like in habit but with thinner heart-shaped leaves. Mildly toxic to pets.

The true heartleaf philodendron, a trailing/climbing aroid native from Mexico through Central and South America and the Caribbean, with introduced populations in Bangladesh and the Seychelles.

A fast, forgiving trailer that climbs readily up to ~13 ft with support; tip-pinching keeps it bushy in hanging baskets. All parts carry calcium oxalate crystals — toxic to cats, dogs and children.

Cold limit: USDA 10-12 (indoor in most US homes) · RHS H1b (18-27°C)

Sources: plants.ces.ncsu.edu, missouribotanicalgarden.org, aspca.org

What heartleaf philodendron's hardiness rating actually means

Heartleaf philodendron 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 (indoor 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). Heartleaf philodendron has no frost tolerance at all — it is an indoor plant in any climate with a real winter.

Concretely, for heartleaf philodendron 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 heartleaf philodendron 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 heartleaf philodendron can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H1b figure above.

Heartleaf philodendron hardiness — frequently asked questions

Is heartleaf philodendron cold hardy?

Heartleaf philodendron 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. Heartleaf philodendron can only live outside year-round in genuinely frost-free climates (roughly USDA 10-12 (indoor in most US homes)); everywhere else it is a houseplant that summers out at most.

What is the minimum temperature heartleaf philodendron can survive?

What hardiness zone is heartleaf philodendron?

Heartleaf philodendron is rated USDA 10-12 (indoor 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 heartleaf philodendron 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 heartleaf philodendron 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.