Cold hardiness & minimum temperature

Is Miss Jekyll love-in-a-mist (Nigella damascena 'Miss Jekyll')cold hardy? Hardiness zone & min temp

Also called Miss Jekyll love-in-a-mist, love-in-a-mist, devil-in-the-bush.

More about miss jekyll love-in-a-mist

About Miss Jekyll love-in-a-mist

Nigella damascena 'Miss Jekyll' · also called Miss Jekyll love-in-a-mist, love-in-a-mist · flowering

Miss Jekyll is an heirloom cultivar of love-in-a-mist producing semi-double sky-blue flowers nestled in feathery, fennel-like foliage, followed by ornamental seed pods. Direct-sow in situ in full sun on free-draining soil. Self-seeds prolifically. A cottage garden classic valued for cut and dried flowers.

Cold limit: USDA 2–11 (cool-season annual) · RHS H5 (5–22°C)

What miss jekyll love-in-a-mist's hardiness rating actually means

Hardiness works differently for miss jekyll love-in-a-mist: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA 2–11 (cool-season annual) — 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

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

Concretely, for miss jekyll love-in-a-mist as it gets too cold:

Light frost (around 0 to −2 °C) damages or kills tender summer crops outright; cold-hardy types take a few degrees of frost.
The plant does not "survive winter" — its life cycle simply ends, by design, when frost arrives or it finishes cropping.
A surprise late spring frost can also kill young transplants set out too early, before the season even starts.

Can miss jekyll love-in-a-mist go outside or overwinter — and where?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost.
In short-season zones, start it indoors or under cover to stretch the effective growing window.
Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

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 miss jekyll love-in-a-mist can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Frost protection for borderline miss jekyll love-in-a-mist

Miss Jekyll love-in-a-mist is right on a hardiness edge in many gardens, so if you are pushing it, these measures buy it the margin it needs:

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks.
Have row cover ready for an unexpected late spring or early autumn frost.
Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.

Miss Jekyll love-in-a-mist hardiness — frequently asked questions

Is miss jekyll love-in-a-mist cold hardy?

Hardiness works differently for miss jekyll love-in-a-mist: it is grown as a seasonal crop, not overwintered. The question is not "what zone" but "how long is your frost-free growing window". A seasonal crop, not a perennial. Miss Jekyll love-in-a-mist is grown 2–11 (cool-season annual); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature miss jekyll love-in-a-mist can survive?

As an annual crop, its "minimum temperature" is the first hard frost — that is the end of the plant's life, not a survivable low. Many types are also damaged by light frost (around 0 °C).

What hardiness zone is miss jekyll love-in-a-mist?

Miss Jekyll love-in-a-mist is rated USDA 2–11 (cool-season annual) and RHS H5 — Hardy in most of the UK and in cold winters.

Can miss jekyll love-in-a-mist survive winter outside?

Time it to your frost dates: sow or plant out after the last spring frost, and aim to harvest before the first autumn frost. In short-season zones, start it indoors or under cover to stretch the effective growing window. Hardier crops in this group can be sown for an autumn or overwintered harvest in mild zones — check the specific crop.

How do I protect miss jekyll love-in-a-mist from frost?

Use fleece, cloches or a cold frame at each end of the season to dodge a borderline frost and add growing weeks. Have row cover ready for an unexpected late spring or early autumn frost. Know your local last- and first-frost dates and count back the crop’s days-to-maturity to schedule the sowing.