Cold hardiness & minimum temperature

Is Few-flowered Lysionotus (Lysionotus pauciflorus)cold hardy? Hardiness zone & min temp

Also called few-flowered lysionotus, Chinese cliff flower.

More about few-flowered lysionotus

About Few-flowered Lysionotus

Lysionotus pauciflorus · also called few-flowered lysionotus, Chinese cliff flower · houseplant

An evergreen epiphytic gesneriad from the cloud forests of southern China, Taiwan, and the eastern Himalayas. Grows as a compact sub-shrub with leathery, lance-shaped leaves and tubular, funnel-shaped lavender-white flowers with dark-veined throats in summer. Relatively cold-tolerant for a gesneriad; grows well in filtered indoor light or mild outdoor shade.

Cold limit: USDA 9b–10 · RHS H2 (5–24 °C)

Watch for — Failure to flower indoors: Insufficient light and lack of a mild cool period in winter can prevent bud set. Provide a slightly cooler, brighter rest period in winter (around 10–13 °C) and move to a brighter position in spring to trigger summer flowering.

What few-flowered lysionotus's hardiness rating actually means

Few-flowered Lysionotus 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 9b–10 — 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. Few-flowered Lysionotus shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for few-flowered lysionotus 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 few-flowered lysionotus go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9b–10 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 few-flowered lysionotus 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 few-flowered lysionotus

Few-flowered Lysionotus 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.

Few-flowered Lysionotus hardiness — frequently asked questions

Is few-flowered lysionotus cold hardy?

Few-flowered Lysionotus 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 9b–10 (and sheltered UK gardens) few-flowered lysionotus can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature few-flowered lysionotus can survive?

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

What hardiness zone is few-flowered lysionotus?

Few-flowered Lysionotus is rated USDA 9b–10 and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can few-flowered lysionotus survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9b–10 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 few-flowered lysionotus 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.