Cold hardiness & minimum temperature

Is Mustard Greens 'Golden Streaks' (Brassica juncea 'Golden Streaks')cold hardy? Hardiness zone & min temp

Also called Golden Streaks mustard, golden feathered mustard.

More about mustard greens 'golden streaks'

About Mustard Greens 'Golden Streaks'

Brassica juncea 'Golden Streaks' · also called Golden Streaks mustard, golden feathered mustard · edible

'Golden Streaks' is a fast-growing Japanese mustard with finely serrated, lime-yellow frilled leaves and a warm, building mustard heat. Sown as a cut-and-come-again salad or stir-fry green, it matures in 40-50 days, thrives in cool weather, and bolts quickly in heat. Excellent for autumn and early-spring succession sowing in beds or containers.

Cold limit: USDA Annual; grows in zones 2-11 as a cool-season crop · RHS H5 (hardy young plants tolerate light frost) (10-24°C)

Watch for — Bolting in heat: Long days and temperatures above ~24°C trigger rapid flowering. Sow in spring and autumn and harvest young to avoid the harsh, bitter pre-bolt leaves.

What mustard greens 'golden streaks''s hardiness rating actually means

Yes — mustard greens 'golden streaks' is genuinely cold hardy. Rated RHS H5 and USDA Annual; grows in zones 2-11 as a cool-season crop, it lives outdoors all year and needs winter cold rather than protection from it. Its RHS rating of H5 means: Hardy in most of the UK and in cold winters. On the US scale that maps to USDA Annual; grows in zones 2-11 as a cool-season crop — 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 −15 to −10 °C. Mustard Greens 'Golden Streaks' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for mustard greens 'golden streaks' as it gets too cold:

It tolerates winter lows to about −15 to −10 °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 mustard greens 'golden streaks' go outside or overwinter — and where?

Plant it out within USDA Annual; grows in zones 2-11 as a cool-season crop 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 mustard greens 'golden streaks' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Mustard Greens 'Golden Streaks' hardiness — frequently asked questions

Is mustard greens 'golden streaks' cold hardy?

Yes — mustard greens 'golden streaks' is genuinely cold hardy. Rated RHS H5 and USDA Annual; grows in zones 2-11 as a cool-season crop, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Mustard Greens 'Golden Streaks' is hardy across USDA Annual; grows in zones 2-11 as a cool-season crop; 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 mustard greens 'golden streaks' can survive?

Minimum survivable temperature is roughly about −15 to −10 °C. Mustard Greens 'Golden Streaks' is built for winter — once established it takes hard frost and snow in its stride.

What hardiness zone is mustard greens 'golden streaks'?

Mustard Greens 'Golden Streaks' is rated USDA Annual; grows in zones 2-11 as a cool-season crop and RHS H5 — Hardy in most of the UK and in cold winters.

Can mustard greens 'golden streaks' survive winter outside?

Plant it out within USDA Annual; grows in zones 2-11 as a cool-season crop 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 mustard greens 'golden streaks' below its minimum temperature?

It tolerates winter lows to about −15 to −10 °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.