Cold hardiness & minimum temperature

Is Bon Bon Mix Pot Marigold (Calendula officinalis)cold hardy? Hardiness zone & min temp

Also called Pot Marigold, Common Marigold, English Marigold, Ruddles.

More about bon bon mix pot marigold

About Bon Bon Mix Pot Marigold

Calendula officinalis · also called Pot Marigold, Common Marigold · flowering

Bon Bon Mix Calendula is a compact, dwarf pot marigold bearing fully double blooms in vivid orange, yellow, and apricot tones from late spring through autumn. A tough, cool-season annual that self-seeds freely and is edible. Listed by the ASPCA as mildly toxic to pets — ingestion may cause mild skin and gastric irritation.

Cold limit: USDA 2-11 (cool-season annual, tolerates light frost) · RHS H3 (7-24°C)

Watch for — Failing to flower in summer heat: Calendula is cool-season; plants slow or cease flowering when temperatures exceed 27°C. Resume sowing in late summer for an autumn display.

What bon bon mix pot marigold's hardiness rating actually means

Hardiness works differently for bon bon mix pot marigold: 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 H3 means: Half-hardy — comes through mild UK winters outside but is killed by a hard freeze. On the US scale that maps to USDA 2-11 (cool-season annual, tolerates light frost) — 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 bon bon mix pot marigold 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 bon bon mix pot marigold 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 bon bon mix pot marigold can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H3 figure above.

Frost protection for borderline bon bon mix pot marigold

Bon Bon Mix Pot Marigold 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.

Bon Bon Mix Pot Marigold hardiness — frequently asked questions

Is bon bon mix pot marigold cold hardy?

Hardiness works differently for bon bon mix pot marigold: 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. Bon Bon Mix Pot Marigold is grown 2-11 (cool-season annual, tolerates light frost); you sow after the last frost and harvest before the first one, then start again next year.

What is the minimum temperature bon bon mix pot marigold 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 bon bon mix pot marigold?

Bon Bon Mix Pot Marigold is rated USDA 2-11 (cool-season annual, tolerates light frost) and RHS H3 — Half-hardy — comes through mild UK winters outside but is killed by a hard freeze.

Can bon bon mix pot marigold 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 bon bon mix pot marigold 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.