Cold hardiness & minimum temperature

Is Dusky Coral Pea (Kennedia rubicunda)cold hardy? Hardiness zone & min temp

Also called Dusky Coral Pea, Running Postman (misapplied).

More about dusky coral pea

About Dusky Coral Pea

Kennedia rubicunda · also called Dusky Coral Pea, Running Postman (misapplied) · flowering

Kennedia rubicunda is a vigorous Australian native climbing or scrambling vine bearing striking dusky coral-red pea flowers in late winter through spring. Extremely tough and drought tolerant once established, it thrives in poor, free-draining soils and full sun. An excellent screen plant, groundcover, or erosion-control species for warm, dry gardens.

Cold limit: USDA 9–11 · RHS H2 (5–35°C)

Watch for — Root rot in heavy or waterlogged soil: The most common cause of failure. Kennedia rubicunda is intolerant of wet feet. Plant in raised beds or improved drainage if soils are heavy. Never irrigate established plants in winter in cool climates.

What dusky coral pea's hardiness rating actually means

Dusky Coral Pea 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 9–11 — 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. Dusky Coral Pea shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for dusky coral pea 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 dusky coral pea go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9–11 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 dusky coral pea 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 dusky coral pea

Dusky Coral Pea 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.

Dusky Coral Pea hardiness — frequently asked questions

Is dusky coral pea cold hardy?

Dusky Coral Pea 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 9–11 (and sheltered UK gardens) dusky coral pea can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature dusky coral pea can survive?

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

What hardiness zone is dusky coral pea?

Dusky Coral Pea is rated USDA 9–11 and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can dusky coral pea survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9–11 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 dusky coral pea 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.