Cold hardiness & minimum temperature

Is Parsons Juniper (Juniperus chinensis 'Parsonii')cold hardy? Hardiness zone & min temp

Also called Parsons Juniper, Spreading Chinese Juniper.

More about parsons juniper

About Parsons Juniper

Juniperus chinensis 'Parsonii' · also called Parsons Juniper, Spreading Chinese Juniper · flowering

Parsons Juniper is a tough, low, wide-spreading evergreen groundcover juniper with dense, grey-green to blue-green foliage. Drought-tolerant once established, it excels on banks, in mass plantings and along borders, handling full sun, poor soil and heat with ease. Its flat, layered habit suppresses weeds and needs almost no maintenance.

Cold limit: USDA 4-9 · RHS H6 (-29 to 35°C)

What parsons juniper's hardiness rating actually means

Yes — parsons juniper 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. Parsons Juniper is built for winter — once established it takes hard frost and snow in its stride.

Concretely, for parsons juniper 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 parsons juniper 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 parsons juniper can be outside. US growers can check USDA zones; UK growers should use the RHS hardiness ratings, which match the H6 figure above.

Parsons Juniper hardiness — frequently asked questions

Is parsons juniper cold hardy?

Yes — parsons juniper 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. Parsons Juniper 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 parsons juniper can survive?

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

What hardiness zone is parsons juniper?

Parsons Juniper is rated USDA 4-9 and RHS H6 — Hardy throughout the UK and northern Europe.

Can parsons juniper 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 parsons juniper 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.