Cold hardiness & minimum temperature

Is Jonkheer van Tets Redcurrant (Ribes rubrum 'Jonkheer van Tets')cold hardy? Hardiness zone & min temp

Also called Jonkheer van Tets redcurrant, early redcurrant.

More about jonkheer van tets redcurrant

About Jonkheer van Tets Redcurrant

Ribes rubrum 'Jonkheer van Tets' · also called Jonkheer van Tets redcurrant, early redcurrant · edible

'Jonkheer van Tets' is a popular early-season redcurrant bearing long trusses (strigs) of glossy, bright-red, slightly tart berries in early to mid-summer. Vigorous, upright, and heavy-cropping, it fruits on a permanent framework of older wood, so it trains well as a bush, cordon, or fan against a wall in sun or part shade.

Cold limit: USDA 3-7 (very hardy; needs winter chill) · RHS H6 (10-24°C)

What jonkheer van tets redcurrant's hardiness rating actually means

Yes — jonkheer van tets redcurrant is genuinely cold hardy. Rated RHS H6 and USDA 3-7 (very hardy; needs winter chill), 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 3-7 (very hardy; needs winter chill) — 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. Jonkheer van Tets Redcurrant is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for jonkheer van tets redcurrant 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 jonkheer van tets redcurrant go outside or overwinter — and where?

Plant it out within USDA 3-7 (very hardy; needs winter chill) 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 jonkheer van tets redcurrant can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Jonkheer van Tets Redcurrant hardiness — frequently asked questions

Is jonkheer van tets redcurrant cold hardy?

Yes — jonkheer van tets redcurrant is genuinely cold hardy. Rated RHS H6 and USDA 3-7 (very hardy; needs winter chill), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Jonkheer van Tets Redcurrant is hardy across USDA 3-7 (very hardy; needs winter chill); 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 jonkheer van tets redcurrant can survive?

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

What hardiness zone is jonkheer van tets redcurrant?

Jonkheer van Tets Redcurrant is rated USDA 3-7 (very hardy; needs winter chill) and RHS H6 — Hardy throughout the UK and northern Europe.

Can jonkheer van tets redcurrant survive winter outside?

Plant it out within USDA 3-7 (very hardy; needs winter chill) 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 jonkheer van tets redcurrant 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.