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Hookspur Violet, Early Blue Violet, Western Dog Violet

Viola adunca

Family: Violaceae (vy-oh-LAY-see-ee) (Info)
Genus: Viola (vy-OH-la) (Info)
Species: adunca (AD-un-kuh) (Info)


Alpines and Rock Gardens


Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Flowers are fragrant

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Where to Grow:

Unknown - Tell us


under 6 in. (15 cm)


3-6 in. (7-15 cm)


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:

Sun to Partial Shade

Light Shade


Unknown - Tell us

Bloom Color:



Bloom Time:

Mid Spring

Late Spring/Early 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:

Unknown - Tell us

Propagation Methods:

From seed; direct sow outdoors in fall

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; sow indoors before last frost

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

Seed Collecting:

Bag seedheads to capture ripening seed

Allow pods to dry on plant; break open to collect seeds

Properly cleaned, seed can be successfully stored


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

Anchorage, Alaska

Richmond, California

Portland, Oregon (2 reports)

Camas, Washington

Gardeners' Notes:


On Dec 9, 2007, adunca from Camas, WA wrote:

This is the larval host plant for several threatened butterflies in my area (Washington/Oregon). I have a few viola adunca that I grew from seed that I got from a professor at Lewis & Clark college but I would like to know if there is anyone in my area (Clark Co. Washington) who may have some from local native stock.


On Jan 28, 2006, Huntress from Edmonton
Canada wrote:

Grows as a wildflower in central Alberta, Canada in marshy areas with partial shade. Here, also known as blue marsh violet.

Small flowers, but very pretty and smells wonderful.

Seeds harvested from wild plants can be grown fairly easily, although they may not winter over well.


On Jan 23, 2003, Baa wrote:

A small perennial Violet from the USA.

Has ovate, mid-deep green, slightly toothed leaves. Bears small, light blue to violet flowers that have a faint scent.

Flowers late March - May

Loves a moist, well-drained soil in sun or light shade. Dislikes competition so grow with other small growing plants.