Cold hardiness & minimum temperature

Is Stripe It Rich Hakone Grass (Hakonechloa macra 'Stripe It Rich')cold hardy? Hardiness zone & min temp

Also called Golden Hakone Grass, Japanese Forest Grass 'Stripe It Rich'.

More about stripe it rich hakone grass

About Stripe It Rich Hakone Grass

Hakonechloa macra 'Stripe It Rich' · also called Golden Hakone Grass, Japanese Forest Grass 'Stripe It Rich' · flowering

Stripe It Rich Hakone Grass is a slow-growing, cascading ornamental grass from Japanese mountain woodlands, prized for its arching bright gold and green striped leaves that turn russet and red in autumn. It thrives in dappled shade and moist, fertile soil. It is not listed by the ASPCA as toxic and is considered pet-safe.

Cold limit: USDA 5-9 · RHS H6 (-5-25°C)

Watch for — Crown rot in wet winters: Persistently waterlogged soil in cold winters can rot the crown. Ensure good drainage and avoid planting in low-lying hollows.

What stripe it rich hakone grass's hardiness rating actually means

Yes — stripe it rich hakone grass is genuinely cold hardy. Rated RHS H6 and USDA 5-9, 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 — 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. Stripe It Rich Hakone Grass is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for stripe it rich hakone grass 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 stripe it rich hakone grass go outside or overwinter — and where?

Plant it out within USDA 5-9 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 stripe it rich hakone grass can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Stripe It Rich Hakone Grass hardiness — frequently asked questions

Is stripe it rich hakone grass cold hardy?

Yes — stripe it rich hakone grass is genuinely cold hardy. Rated RHS H6 and USDA 5-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Stripe It Rich Hakone Grass is hardy across USDA 5-9; 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 stripe it rich hakone grass can survive?

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

What hardiness zone is stripe it rich hakone grass?

Stripe It Rich Hakone Grass is rated USDA 5-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can stripe it rich hakone grass survive winter outside?

Plant it out within USDA 5-9 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 stripe it rich hakone grass 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.