Cold hardiness & minimum temperature

Is Crocus 'Pickwick' (Crocus vernus 'Pickwick')cold hardy? Hardiness zone & min temp

Also called Pickwick crocus, striped Dutch crocus, lilac striped crocus.

More about crocus 'pickwick'

About Crocus 'Pickwick'

Crocus vernus 'Pickwick' · also called Pickwick crocus, striped Dutch crocus · flowering

Crocus 'Pickwick' is a large Dutch crocus prized for pale lilac petals boldly feathered with deep violet stripes and a dark purple base. It flowers in early to mid spring from autumn-planted corms set 8-10 cm deep in full sun and gritty soil. Vigorous and easy, it naturalises in lawns and borders and returns dependably for years.

Cold limit: USDA 3-8 · RHS H6 (-15 to 18°C)

Watch for — Flowers won't open / stay closed: Crocus blooms only open in sun and warmth. In shade or cold dull weather they stay shut — relocate to a sunnier spot for a full display.

What crocus 'pickwick''s hardiness rating actually means

Yes — crocus 'pickwick' is genuinely cold hardy. Rated RHS H6 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H6 means: Hardy throughout the UK and northern Europe. On the US scale that maps to USDA 3-8 — 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 −20 to −15 °C. Crocus 'Pickwick' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for crocus 'pickwick' as it gets too cold:

It tolerates winter lows to about −20 to −15 °C once established.
Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root.
First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.

Can crocus 'pickwick' go outside or overwinter — and where?

Plant it out within USDA 3-8 and it overwinters with little or no help.
It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy.
The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

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 crocus 'pickwick' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Crocus 'Pickwick' hardiness — frequently asked questions

Is crocus 'pickwick' cold hardy?

Yes — crocus 'pickwick' is genuinely cold hardy. Rated RHS H6 and USDA 3-8, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Crocus 'Pickwick' is hardy across USDA 3-8; it belongs in the ground or a frost-proof container, not on a windowsill, and many types actively need a cold winter to perform.

What is the minimum temperature crocus 'pickwick' can survive?

Minimum survivable temperature is roughly about −20 to −15 °C. Crocus 'Pickwick' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is crocus 'pickwick'?

Crocus 'Pickwick' is rated USDA 3-8 and RHS H6 — Hardy throughout the UK and northern Europe.

Can crocus 'pickwick' survive winter outside?

Plant it out within USDA 3-8 and it overwinters with little or no help. It does not want to come indoors — a warm winter room actually weakens a hardy plant by denying it dormancy. The real risks in its range are waterlogging, wind-rock on young plants, and a late hard frost on new growth — not ordinary winter cold.

What happens to crocus 'pickwick' below its minimum temperature?

It tolerates winter lows to about −20 to −15 °C once established. Below its rated zone, the visible damage is browned or blackened top growth and, in the worst case, a killed crown or root. First-year, newly planted, or container-grown specimens are noticeably less hardy than established garden plants — the roots are exposed.