Cold hardiness & minimum temperature

Is Crassula Pellucida (Crassula pellucida subsp. marginalis 'Variegata')cold hardy? Hardiness zone & min temp

Also called calico kitten, variegated crassula, heart crassula.

More about crassula pellucida

About Crassula Pellucida

Crassula pellucida subsp. marginalis 'Variegata' · also called calico kitten, variegated crassula · houseplant

Crassula 'Calico Kitten' is a trailing succulent with small heart-shaped leaves splashed cream, green, pink and rose, blushing deeper in bright light. It cascades from pots and hanging baskets, wants gritty fast-draining soil and only occasional water, and produces tiny white star flowers. A charming, easy succulent that is toxic to cats and dogs.

Cold limit: USDA 9-11 (indoor where frost occurs) · RHS H2 (15-24°C)

Watch for — Overwatering and rot: The fine roots and thin stems rot easily in wet soil. Let the gritty mix dry between waterings and cut back sharply in winter.

What crassula pellucida's hardiness rating actually means

Crassula Pellucida 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 (indoor where frost occurs) — 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. Crassula Pellucida shrugs off cold nights but a real, sustained freeze will kill it.

Concretely, for crassula pellucida 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 crassula pellucida go outside or overwinter — and where?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-11 (indoor where frost occurs) 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 crassula pellucida 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 crassula pellucida

Crassula Pellucida 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.

Crassula Pellucida hardiness — frequently asked questions

Is crassula pellucida cold hardy?

Crassula Pellucida 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 (indoor where frost occurs) (and sheltered UK gardens) crassula pellucida can stay out; in colder areas it must be lifted, brought in, or treated as a frost-tender plant.

What is the minimum temperature crassula pellucida can survive?

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

What hardiness zone is crassula pellucida?

Crassula Pellucida is rated USDA 9-11 (indoor where frost occurs) and RHS H2 — Tender — survives a frost-free greenhouse or a very mild, sheltered spot.

Can crassula pellucida survive winter outside?

It can live outside year-round only in the mildest, most sheltered part of USDA 9-11 (indoor where frost occurs) 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 crassula pellucida 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.