Petrorhagia Species, Coat Flower, Tunic Flower

Petrorhagiasaxifraga

Family
Caryophyllaceae (kar-ree-oh-fil-AY-see-ee)
Genus
Petrorhagia (pet-roh-RAG-ee-uh)
Species
saxifraga (saks-if-FRAG-uh)
Synonym
Tunica saxifraga
Dianthus saxifragus
Sun Exposure
Full Sun
Foliage
Grown for foliage
Herbaceous
Height
6-12 in. (15-30 cm)
Spacing
9-12 in. (22-30 cm)
Hardiness
USDA Zone 4a: to -34.4 °C (-30 °F)
USDA Zone 4b: to -31.6 °C (-25 °F)
USDA Zone 5a: to -28.8 °C (-20 °F)
USDA Zone 5b: to -26.1 °C (-15 °F)
USDA Zone 6a: to -23.3 °C (-10 °F)
USDA Zone 6b: to -20.5 °C (-5 °F)
USDA Zone 7a: to -17.7 °C (0 °F)
USDA Zone 7b: to -14.9 °C (5 °F)
Danger
N/A
Bloom Color
Pale Pink
White/Near White
Bloom Time
Late Spring/Early Summer
Late Summer/Early Fall
Other Details
Category
Alpines and Rock Gardens
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Foliage Color
Where to Grow
Bloom Characteristics
Bloom Size
Other details
Soil pH requirements
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
Patent Information
Non-patented
Propagation Methods
From herbaceous stem cuttings
Seed Collecting
Regional

This plant is said to grow outdoors in the following regions:

Palmer, Alaska

Seward, Alaska

Parker, Colorado

Lexington, Massachusetts

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Gardener's Notes:

3
positives
2
neutrals
0
negative
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J
Palmer, AK (Zone 3b) | June 2011 | positive

This plant is happier growing in the D4 gravel of my driveway than in my rock garden or perennial beds.

A
Calgary, AB (Zone 3b) | March 2008 | neutral

As Petrorhagia saxifraga is totally hardy in zone 3 (in this area which is subject to chinooks and no reliable snow cover), and, i...Read More

W
Seward, AK (Zone 3b) | February 2007 | positive

I've grown this plant as an annual, using it in baskets and borders. Seeds are easily harvested by cutting the spent stems, putting them ...Read More

T
| November 2002 | neutral

I haven't grown it before but a friend grows it & just loves it! As for propagation, it self-seeds prolifically. It is very easy and reli...Read More

J
J
Stewart, MN (Zone 4a) | October 2002 | positive

I've been growing one plant for the past 4 years. It is covered with pink blossoms from mid June to Mid August. I have not yet figured ou...Read More

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