Cold hardiness & minimum temperature

Is Endura Scarlet Verbena (Verbena x hybrida)cold hardy? Hardiness zone & min temp

Also called Garden Verbena, Scarlet Verbena, Hybrid Verbena.

More about endura scarlet verbena

About Endura Scarlet Verbena

Verbena x hybrida · also called Garden Verbena, Scarlet Verbena · flowering

Endura Scarlet Verbena is a robust, heat- and drought-tolerant annual bedding plant producing vivid scarlet flower clusters on trailing to spreading stems from early summer to first frost. Exceptional performance in containers, hanging baskets, and borders. The ASPCA lists Verbena species as toxic to dogs, cats, and horses.

Cold limit: USDA 8-11 (treated as frost-tender annual in most temperate regions) · RHS H2 (15-32°C)

What endura scarlet verbena's hardiness rating actually means

Endura Scarlet Verbena 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 8-11 (treated as frost-tender annual in most temperate regions) — 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. Endura Scarlet Verbena shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for endura scarlet verbena 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 endura scarlet verbena go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (treated as frost-tender annual in most temperate regions) 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 endura scarlet verbena 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 endura scarlet verbena

Endura Scarlet Verbena 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.

Endura Scarlet Verbena hardiness — frequently asked questions

Is endura scarlet verbena cold hardy?

Endura Scarlet Verbena 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 8-11 (treated as frost-tender annual in most temperate regions) (and sheltered UK gardens) endura scarlet verbena can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature endura scarlet verbena can survive?

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

What hardiness zone is endura scarlet verbena?

Endura Scarlet Verbena is rated USDA 8-11 (treated as frost-tender annual in most temperate regions) and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can endura scarlet verbena survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 8-11 (treated as frost-tender annual in most temperate regions) 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 endura scarlet verbena 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.