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Rockfoil, Mossy Saxifrage 'Purple Robe'

Saxifraga x arendsii

Family: Saxifragaceae (saks-ih-frag-AY-see-ee) (Info)
Genus: Saxifraga (saks-if-FRAG-uh) (Info)
Species: x arendsii (ar-END-see-eye) (Info)
Cultivar: Purple Robe


Alpines and Rock Gardens



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


6-12 in. (15-30 cm)


6-9 in. (15-22 cm)

9-12 in. (22-30 cm)


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)

Sun Exposure:

Sun to Partial Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Mid Spring



Other details:

Unknown - Tell us

Soil pH requirements:

Unknown - Tell us

Patent Information:

Unknown - Tell us

Propagation Methods:

Unknown - Tell us

Seed Collecting:

Unknown - Tell us


This plant has been said to grow in the following regions:


Juneau, Alaska

Waterford, California

Ewing, Kentucky

Ann Arbor, Michigan

Blissfield, Michigan

Dearborn Heights, Michigan

Albertville, Minnesota

Auburn, New Hampshire

Bloomfield, New Mexico

Lima, Ohio

Salt Lake City, Utah

Kalama, Washington

Midland, Washington

Grafton, Wisconsin

show all

Gardeners' Notes:


On Jun 16, 2012, Godsnewine from Lawrence, KS wrote:

I live in NE KS and purchased several of these plants this Spring. They are lovley and I had such great expectations for them as some were planted around a newly constructed stone patch and three were planted in a cluster with Helleborus at the feet of roses and clematis vines. They performed well for weeks in well drained soil but started turning dark black brown in small patches and now it would appear that around the pathway there are nothing but dark patches where once a carpet of lush green cushions once sit and smiled. The flower bed is doing the same thing but at a slower pace. I am so disappointed in the loss of so many that says they required full sun of which the flower bed does not get the extreme sun in the mid to late afternoons. The plants around the walking path gets late... read more


On Sep 3, 2009, floating_stump from Grafton, WI wrote:

Mine gets morning sun and afternoon shade. Most tips say to keep it moist but well drained. I don't think my soil is particularly well-drained. I don't go out of my way to water it, but I don't think it every really dries out. It seems happy. It's a spreading, rubbery green mound. The flowers aren't exactly thick, but there are a lot, and it blooms for several weeks in early summer, here in Wisconsin.

I like it, for its own sake, but I can't figure out what to do with it, in a visual sense.


On Aug 31, 2002, Weezingreens from Seward, AK (Zone 3b) wrote:

Purple Robe Saxifrag grows well in our SouthCentral Alaska climate. It is an excellent rockgarden plant because the foliage forms a soft mat of celery green, and the flowers are suspended on long thin stems that may rise upward, or curl about the plant. This plant does not like hot, dry conditions.