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Digger's Speedwell
Derwentia perfoliata

Family: Plantaginaceae
Genus: Derwentia (der-WENT-ee-uh) (Info)
Species: perfoliata (per-foh-lee-AY-tuh) (Info)


Alpines and Rock Gardens



18-24 in. (45-60 cm)


9-12 in. (22-30 cm)


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)

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)

Sun Exposure:

Sun to Partial Shade


Unknown - Tell us

Bloom Color:


Bloom Time:

Late Summer/Early Fall



Other details:

Drought-tolerant; suitable for xeriscaping

Soil pH requirements:

Unknown - Tell us

Patent Information:


Propagation Methods:

By dividing the rootball

Seed Collecting:

Unknown - Tell us


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

Clayton, California

Fairfield, California (2 reports)

Fort Bragg, California

Hesperia, California

Richmond, California

San Jose, California

Wilmington, Delaware

Elizabeth City, North Carolina

Seattle, Washington

show all

Gardeners' Notes:


On Oct 2, 2007, fbgardener from Fort Bragg, CA wrote:

I am zone 9b, and I garden in very sandy acidic soil, (ph5.5 to 6.0). My speedwells are so happy and beautiful. I love them and I love the beautiful little blue flowers. Also, I live a mile from the Pacific Ocean, with frequent fog and high humidity and relatively cool temps, in the 60's, and all my diggers get at least a half day of sun.


On Sep 13, 2003, Happenstance from Northern California, CA wrote:

Loves the wind, lovely nodding flower heads, tolerates 9b heat well, fast growing shrub with tall blue/violet flower stalks.


On Sep 12, 2003, kennedyh from Churchill, Victoria
Australia (Zone 10a) wrote:

This lovely plant is an Australian native and I am interested to learn it is in cultivation in USA. It grows at high altitude in the wild, being very common beside the roads near Mt. Kosciusko in New South Wales (Australia's highest mountain).
It is quite common in cultivation in Australia, although I have not grown it myself. There is a vigorous plant in flower at the moment in the grounds of the University where I work.