Cold hardiness & minimum temperature

Is Marjorie's Seedling Plum (Prunus domestica 'Marjorie's Seedling')cold hardy? Hardiness zone & min temp

Also called Marjorie's Seedling plum, late plum.

More about marjorie's seedling plum

About Marjorie's Seedling Plum

Prunus domestica 'Marjorie's Seedling' · also called Marjorie's Seedling plum, late plum · edible

Marjorie's Seedling is a vigorous, self-fertile late-season European plum ripening in late September, prized for reliable heavy crops of large blue-black, dual-purpose fruit. It tolerates cooler, wetter UK conditions better than most cultivars, flowers late to dodge frost, and crops well even in northern gardens with minimal pollination fuss.

Cold limit: USDA 5-9 (outdoor orchard tree) · RHS H6 (-20 to 30°C)

What marjorie's seedling plum's hardiness rating actually means

Yes — marjorie's seedling plum is genuinely cold hardy. Rated RHS H6 and USDA 5-9 (outdoor orchard tree), 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 5-9 (outdoor orchard tree) — 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. Marjorie's Seedling Plum is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for marjorie's seedling plum 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 marjorie's seedling plum go outside or overwinter — and where?

Plant it out within USDA 5-9 (outdoor orchard tree) 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 marjorie's seedling plum can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Marjorie's Seedling Plum hardiness — frequently asked questions

Is marjorie's seedling plum cold hardy?

Yes — marjorie's seedling plum is genuinely cold hardy. Rated RHS H6 and USDA 5-9 (outdoor orchard tree), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Marjorie's Seedling Plum is hardy across USDA 5-9 (outdoor orchard tree); 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 marjorie's seedling plum can survive?

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

What hardiness zone is marjorie's seedling plum?

Marjorie's Seedling Plum is rated USDA 5-9 (outdoor orchard tree) and RHS H6 — Hardy throughout the UK and northern Europe.

Can marjorie's seedling plum survive winter outside?

Plant it out within USDA 5-9 (outdoor orchard tree) 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 marjorie's seedling plum 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.