Cold hardiness & minimum temperature

Is Simon Bamboo (Pleioblastus simonii)cold hardy? Hardiness zone & min temp

Also called Simon Bamboo, Medake.

More about simon bamboo

About Simon Bamboo

Pleioblastus simonii · also called Simon Bamboo, Medake · tropical

Pleioblastus simonii (Medake) is a tall, vigorous running bamboo native to Japan reaching 3–6 m in warm climates. It forms dense thickets with slender culms and lance-shaped mid-green leaves. Hardy to USDA zone 6, it works well as a privacy screen or windbreak. Running rhizomes require containment; cut back crowded clumps every few years to rejuvenate.

Cold limit: USDA 6–10 · RHS H6 (-15 to 35°C)

Watch for — Culm overcrowding reducing vigour: Established thickets become congested after 5–7 years. Thin out old and weak culms at ground level in late winter, leaving only the strongest canes from the past 2–3 seasons. This improves light penetration and culm quality.

What simon bamboo's hardiness rating actually means

Yes — simon bamboo is genuinely cold hardy. Rated RHS H6 and USDA 6–10, 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 6–10 — 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. Simon Bamboo is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for simon bamboo 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 simon bamboo go outside or overwinter — and where?

Plant it out within USDA 6–10 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 simon bamboo can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Simon Bamboo hardiness — frequently asked questions

Is simon bamboo cold hardy?

Yes — simon bamboo is genuinely cold hardy. Rated RHS H6 and USDA 6–10, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Simon Bamboo is hardy across USDA 6–10; 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 simon bamboo can survive?

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

What hardiness zone is simon bamboo?

Simon Bamboo is rated USDA 6–10 and RHS H6 — Hardy throughout the UK and northern Europe.

Can simon bamboo survive winter outside?

Plant it out within USDA 6–10 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 simon bamboo 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.