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Giant flowered Soapwort 'Max Frei'

Saponaria x lempergii

Family: Caryophyllaceae (kar-ree-oh-fil-AY-see-ee) (Info)
Genus: Saponaria (sap-oh-NAIR-ee-uh) (Info)
Species: x lempergii
Cultivar: Max Frei


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:

Grow outdoors year-round


6-12 in. (15-30 cm)


15-18 in. (38-45 cm)


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)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun

Sun to Partial Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Late Summer/Early Fall



Other details:

Unknown - Tell us

Soil pH requirements:

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:


Propagation Methods:

Unknown - Tell us

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


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

Roslindale, Massachusetts

Enid, Oklahoma

Portland, Oregon

Gardeners' Notes:


On Jun 17, 2015, PattyH98 from Portland, OR (Zone 8b) wrote:

I have grown this plant for over ten years and it is still thriving here in my Pacific NW zone 8b garden, which rarely gets water during the dry summers here. In this region it blooms early-mid summer into fall.
I cut it back to shape it in early spring and to keep it a better size for the space I have it in.
After it blooms I shear it back for more blooms and to keep the plant looking tidier.
Recommend planting this plant in the front of the boarder for best show.
To date I have had no pests or diseases issues with it either.
A great low maintenance plant.


On Mar 12, 2015, coriaceous from ROSLINDALE, MA wrote:

Very showy flowers, with an exceptionally long season of bloom, from June till frost. The flowers are no larger than those of other soapwort species. Plants can be short-lived---excellent drainage is essential.

Intolerant of the hot humid summers of the southeastern US. Hardy in Z3-7 in the east. Tolerant of drought.

Sterile, can be propagated by rooting cuttings. The woody rootstock is difficult to divide. Clumps do not spread (It's caespitose).

This is a hybrid between S. cypria and S. sicula var intermedia (aka S. haussknechtii) made in mid-twentieth century Austria by Fritz Lemberg. 'Max Frei' is the only cultivar.


On Aug 21, 2004, pokerboy from Canberra,
Australia (Zone 8b) wrote:

Very pretty flowering perennial. Likes full sun and well-drained soil. Very pretty white of pink flowers in Summer. pokerboy.