Cranesbill, Bigroot Geranium, Bulgarian Geranium, Rock Crane's-bill 'Spessart'

Geranium macrorrhizum

Family: Geraniaceae (jer-ay-nee-AY-see-ee) (Info)
Genus: Geranium (jer-AY-nee-um) (Info)
Species: macrorrhizum (mak-roh-RY-zum) (Info)
Cultivar: Spessart
» View all varieties of Hardy Geraniums



Foliage Color:

Unknown - Tell us

Bloom Characteristics:

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

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


12-18 in. (30-45 cm)


15-18 in. (38-45 cm)


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)

Sun Exposure:

Full Sun

Sun to Partial Shade



Bloom Color:

White/Near White

Bloom Time:

Mid Spring

Late Spring/Early Summer




Other details:

May be a noxious weed or invasive

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 rhizomes, tubers, corms or bulbs (including offsets)

Self-sows freely; deadhead if you do not want volunteer seedlings next season

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

Croton On Hudson, New York

Oklahoma City, Oklahoma

Gardeners' Notes:


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

An excellent weed-suppressing groundcover. This is not aggressive or weedy or invasive here, and easily controlled. Spreads slowly.

Foliage is pleasantly fragrant when rubbed. Pine-scented.

Looks untidy in winter here, where the stems are woody and hardy but the foliage is deciduous.


On May 6, 2002, Wintermoor from Jesteburg-Wiedenhof
Germany (Zone 8a) wrote:

This plant is extremely easy to grow, in fact one doesn't need any experience at all as a gardener to grow this one.
The earth in which I have planted it is in fact an old World War 2 bomb site, where a building stood, and was a parking place for over 30 years. Some of the earth was even oil soaked when I planted the Geranium, and it still grew.
The blooms are white, and the stamens are white from the flower to pale red at the end.
Dogs do not like the smell of this plant, and will give it a wide berth.