UK hardiness
Is Phlox drummondii 'Intensia Cabernet' hardy in the UK?
Phlox drummondii 'Intensia Cabernet'
More about phlox drummondii 'intensia cabernet' in the UK
Phlox drummondii 'Intensia Cabernet' and the RHS hardiness rating
Phlox drummondii 'Intensia Cabernet' is rated RHS H3 — half-hardy, meaning it withstands winter minimums of about -5 to 1°C. In practice that means it survives outdoors only in mild or coastal areas, ideally with winter protection (fleece, a sheltered wall). The RHS rating describes an absolute minimum temperature, not an average: a single hard frost below its band is what does the damage, so the question is always "what is the coldest night my garden gets?", not "what is a typical winter here?".
This follows the RHS plant hardiness rating system (H1a–H7), the UK standard. For the US growing-zone view, see the phlox drummondii 'intensia cabernet' USDA hardiness guide.
Does UK region change it?
UK winters vary far more by locality than by latitude. Mild western and coastal areas (the south-west, Pembrokeshire, western Scotland's coast) and urban heat islands run several degrees warmer than inland frost pockets, valleys, and exposed eastern sites at the same latitude. A plant marginal on its RHS rating often survives in a sheltered town garden but fails 20 miles inland — so judge by your own coldest recorded night and microclimate (a south-facing wall, a courtyard) rather than the regional average.
Overwintering phlox drummondii 'intensia cabernet' in the UK
For a borderline-hardy plant, the UK winter killers are not just cold air but cold wet roots and wind. Improve drainage before winter, mulch the root zone, move containers to a sheltered spot or against a warm wall, and use horticultural fleece on hard-frost nights. Established plants in free-draining soil take far more cold than a recently planted one in heavy, wet ground.
Phlox drummondii 'Intensia Cabernet' UK hardiness — frequently asked questions
Is phlox drummondii 'intensia cabernet' hardy in the UK?
Phlox drummondii 'Intensia Cabernet' is rated RHS H3 (half-hardy, hardy to about -5 to 1°C). It survives outdoors only in mild or coastal areas, ideally with winter protection (fleece, a sheltered wall).
Can phlox drummondii 'intensia cabernet' stay outside over winter in the UK?
In most of the UK, yes, if your garden's coldest night stays within its RHS H3 band (around -5 to 1°C). In colder inland or northern gardens, give it a sheltered spot, sharp drainage, and fleece on hard-frost nights.
What does RHS H3 mean?
RHS hardiness ratings run H1a (needs a heated glasshouse) to H7 (survives below -20°C). Phlox drummondii 'Intensia Cabernet''s rating, H3, means half-hardy — it tolerates winter minimums of about -5 to 1°C. The rating is an absolute minimum, not an average.
How do I overwinter phlox drummondii 'intensia cabernet' in the UK?
For a borderline-hardy plant, the UK winter killers are not just cold air but cold wet roots and wind. Improve drainage before winter, mulch the root zone, move containers to a sheltered spot or against a warm wall, and use horticultural fleece on hard-frost nights. Established plants in free-draining soil take far more cold than a recently planted one in heavy, wet ground.
Does UK region change whether phlox drummondii 'intensia cabernet' survives?
UK winters vary far more by locality than by latitude. Mild western and coastal areas (the south-west, Pembrokeshire, western Scotland's coast) and urban heat islands run several degrees warmer than inland frost pockets, valleys, and exposed eastern sites at the same latitude. A plant marginal on its RHS rating often survives in a sheltered town garden but fails 20 miles inland — so judge by your own coldest recorded night and microclimate (a south-facing wall, a courtyard) rather than the regional average.
More phlox drummondii 'intensia cabernet' care
See the full phlox drummondii 'intensia cabernet' care guide, its temperature & humidity needs, and the US (USDA) hardiness version of this page.