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Geranium Species, Giant Herb Robert, Madeiran Cranesbill, Madeira Island Geranium

Geranium maderense

Family: Geraniaceae (jer-ay-nee-AY-see-ee) (Info)
Genus: Geranium (jer-AY-nee-um) (Info)
Species: maderense (ma-der-EN-see) (Info)
» View all varieties of Hardy Geraniums



Water Requirements:

Average Water Needs; Water regularly; do not overwater

Sun Exposure:

Sun to Partial Shade

Light Shade


Grown for foliage



Foliage Color:

Unknown - Tell us


24-36 in. (60-90 cm)


36-48 in. (90-120 cm)

4-6 ft. (1.2-1.8 m)


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

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

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

USDA Zone 11: above 4.5 C (40 F)

Where to Grow:

Unknown - Tell us



Bloom Color:



Bloom Characteristics:

Unknown - Tell us

Bloom Size:

Unknown - Tell us

Bloom Time:

Mid Summer

Late Summer/Early Fall

Mid Fall

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:

From seed; direct sow outdoors in fall

Direct sow as soon as the ground can be worked

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

Seed Collecting:

Unknown - Tell us


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

Arroyo Grande, California

Cardiff By The Sea, California

Carlsbad, California

Castro Valley, California

Clayton, California

Fairfield, California

Fremont, California

Hayward, California

Huntington Beach, California

Malibu, California

Mckinleyville, California

Mission Viejo, California

Monterey Park, California

Oakland, California

Rancho Palos Verdes, California

Richmond, California

Ridgemark, California

Salinas, California

San Francisco, California

San Jose, California

San Leandro, California

Stockton, California

Thousand Oaks, California

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Gardeners' Notes:


On Aug 13, 2019, GEdytha from Oakland, CA wrote:

Am fond of this plant for easily filling in big holes and sprouting dramatic crown of flowers every other year. My white one has yet to bloom. Does anyone know if it can be transplanted? Id like to move it to another part of the garden.


On May 8, 2019, frichberg from Maywood Park, OR wrote:

I just saw these on madeira and fell in love. Has anyone in cooler zones grown in a pot and brought inside in winter? I am in zone 7.


On Nov 24, 2014, coriaceous from ROSLINDALE, MA wrote:

The Royal Horticultural Society has granted this species its coveted Award of Garden Merit (AGM).


On Feb 15, 2009, BayAreaTropics from Hayward, CA wrote:

Easy to grow,hardy, and does reseed..where you want it ,leave them. It does need summer water,more than you might think-no danger it would naturalize. After bloom,like many heavy bloomers,it gets a bit ratty. Prune back or remove and wait for fresh seedlings to replace.


On May 9, 2004, smiln32 from Oklahoma City, OK (Zone 7a) wrote:

This giant geranium from the island of Madeira is technically a biennial. The foliage is so nice that it easy to be patient for the blooms. When in flower in mid spring the plant can reach to 5 feet tall; its massive many branched inflorescence of mauve pink flowers rise above the foliage.


On Nov 24, 2003, eje from San Francisco, CA (Zone 10a) wrote:

Covered with tall cheery sprays of pink-ish flowers in spring. Flowers sporadically the rest of the year. The bumble bees just love it. However, the seeds go everywhere, and every one seems to sprout. The seedlings are easy to identify, and not particularly deeply rooted; but, be aware, if you don't dead head, you're going to have a lot of volunteers. I've seen it referred to as a biennial; but, it is definitely a perennial for me.