Cold hardiness & minimum temperature

Is Trident Maple 'Kifu' (Acer buergerianum 'Kifu')cold hardy? Hardiness zone & min temp

Also called Kifu Trident Maple.

More about trident maple 'kifu'

About Trident Maple 'Kifu'

Acer buergerianum 'Kifu' · also called Kifu Trident Maple · flowering

Trident Maple 'Kifu' (Acer buergerianum) is a vigorous, deciduous bonsai favourite with three-lobed leaves and flaky, exfoliating bark that gives aged trunks great character. It buds back readily on old wood, develops dense ramification, and colours orange-red in autumn. Fast-growing and forgiving, it is one of the best beginner-to-advanced deciduous bonsai for nebari and taper.

Cold limit: USDA 6-9 (grown outdoors, protect roots in hard frost) · RHS H5 (-15 to 30°C)

Watch for — Frost damage to roots: Shallow bonsai roots are vulnerable in hard freezes. Heel the pot into the ground or move to a cold but frost-free shelter over winter.

What trident maple 'kifu''s hardiness rating actually means

Yes — trident maple 'kifu' is genuinely cold hardy. Rated RHS H5 and USDA 6-9 (grown outdoors, protect roots in hard frost), 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 6-9 (grown outdoors, protect roots in hard frost) — 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. Trident Maple 'Kifu' is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for trident maple 'kifu' 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 trident maple 'kifu' go outside or overwinter — and where?

Plant it out within USDA 6-9 (grown outdoors, protect roots in hard frost) 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 trident maple 'kifu' can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H5 figure above.

Trident Maple 'Kifu' hardiness — frequently asked questions

Is trident maple 'kifu' cold hardy?

Yes — trident maple 'kifu' is genuinely cold hardy. Rated RHS H5 and USDA 6-9 (grown outdoors, protect roots in hard frost), it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Trident Maple 'Kifu' is hardy across USDA 6-9 (grown outdoors, protect roots in hard frost); 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 trident maple 'kifu' can survive?

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

What hardiness zone is trident maple 'kifu'?

Trident Maple 'Kifu' is rated USDA 6-9 (grown outdoors, protect roots in hard frost) and RHS H5 — Hardy in most of the UK and in cold winters.

Can trident maple 'kifu' survive winter outside?

Plant it out within USDA 6-9 (grown outdoors, protect roots in hard frost) 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 trident maple 'kifu' 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.