Hardy Geranium, Meadow Cranesbill 'Summer Skies'

Geranium pratense

Family: Geraniaceae (jer-ay-nee-AY-see-ee) (Info)
Genus: Geranium (jer-AY-nee-um) (Info)
Species: pratense (pray-TEN-see) (Info)
Cultivar: Summer Skies
Additional cultivar information:(PP10695; aka Gernic)
Hybridized by Nicholson
Registered or introduced: 1997
» View all varieties of Hardy Geraniums


Alpines and Rock Gardens


Water Requirements:

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Full Sun

Sun to Partial Shade



Foliage Color:

Unknown - Tell us


18-24 in. (45-60 cm)


15-18 in. (38-45 cm)


USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

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)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

Where to Grow:

Grow outdoors year-round in hardiness zone



Bloom Color:


Bloom Characteristics:

This plant is attractive to bees, butterflies and/or birds

Bloom Size:

Unknown - Tell us

Bloom Time:

Late Spring/Early Summer

Mid Summer

Other details:

Unknown - Tell us

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:


Propagation Methods:

By dividing the rootball

From seed; direct sow after last frost

From seed; germinate in a damp paper towel

Seed Collecting:

Bag seedheads to capture ripening seed

Allow seedheads to dry on plants; remove and collect seeds


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

Belton, Missouri

Wilkes Barre, Pennsylvania

Vancouver, Washington

Gardeners' Notes:


On Oct 18, 2014, coriaceous from ROSLINDALE, MA wrote:

The flower color is mauve-pink, which isn't much like the summer skies I know.

This is probably a hybrid between G. pratense and G. himalayense 'Plenum', according to Paghat's Garden. Paghat strongly recommends G. himalayense 'Plenum' as the superior garden plant, both because it's less inclined to lodge and need support, and also because it has cleaner and tidier foliage.

"Summer Skies" here is the US proprietary trade name owned by Blooms of Bressingham. The cultivar name is 'Gernic'. This has created considerable confusion with another hardy geranium, G. pyrenaicum 'Summer Skies', which is single and fertile.

US PP # 10695 November 1998.


On Jan 3, 2006, bonniewong from edmonton,
Canada wrote:

The first year bloom was really disappointing, but year two made up for it. It had so many buds and blooms, and although the flowers are really small, they make up for it in quality.They are a really different color, cute double forms unlike any other geranium. Watch for flopping and powdery mildew, do not water foliage at all, only at the base of the plant.


On Jul 17, 2005, jamie68 from Vancouver, WA (Zone 8b) wrote:

This is a really pretty, and uncommon Hardy Geranium! It is a bit slower to establish than some, but the unique, double flowers are well worth the extra time!!!!