Cold hardiness & minimum temperature

Is Pink Skyrocket Foamflower (Tiarella 'Pink Skyrocket')cold hardy? Hardiness zone & min temp

Also called Pink Skyrocket Foamflower, Pink Skyrocket Foam Flower.

More about pink skyrocket foamflower

About Pink Skyrocket Foamflower

Tiarella 'Pink Skyrocket' · also called Pink Skyrocket Foamflower, Pink Skyrocket Foam Flower · flowering

Tiarella 'Pink Skyrocket' is a clump-forming hybrid foamflower notable for its dense, tall spikes of delicate shrimp-pink flowers in mid to late spring, rising well above a mound of deeply lobed shiny green foliage marked with dark purple along the midribs. It thrives in moist, humus-rich soil in partial to full shade and is fully hardy throughout the UK and most of temperate Europe. The most important care fact is protecting plants from drought in summer and excessive winter wet. This cultivar is not listed by the ASPCA; a precautionary mildly-toxic classification applies.

Cold limit: USDA 4-9 · RHS H6 (-20 to 25°C)

Watch for — Vine weevil: Cream-coloured C-shaped grubs feed on roots through autumn and winter; adult weevils notch leaf edges. Treat in late summer with parasitic nematodes or a licensed insecticide soil drench when soil temperatures are above 5°C.

What pink skyrocket foamflower's hardiness rating actually means

Yes — pink skyrocket foamflower is genuinely cold hardy. Rated RHS H6 and USDA 4-9, 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 4-9 — 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. Pink Skyrocket Foamflower is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for pink skyrocket foamflower 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 pink skyrocket foamflower go outside or overwinter — and where?

Plant it out within USDA 4-9 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 pink skyrocket foamflower can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Pink Skyrocket Foamflower hardiness — frequently asked questions

Is pink skyrocket foamflower cold hardy?

Yes — pink skyrocket foamflower is genuinely cold hardy. Rated RHS H6 and USDA 4-9, it lives outdoors all year and needs winter cold rather than protection from it. An outdoor plant. Pink Skyrocket Foamflower is hardy across USDA 4-9; 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 pink skyrocket foamflower can survive?

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

What hardiness zone is pink skyrocket foamflower?

Pink Skyrocket Foamflower is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can pink skyrocket foamflower survive winter outside?

Plant it out within USDA 4-9 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 pink skyrocket foamflower 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.