Hookedspur Violet

Viola adunca

Native to:
Canada, Greenland, Labrador, Mexico, United States

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Taxonomy

Division:
Magnoliophyta | - Flowering plants
Family:
Violaceae
Genus:
Viola
Species:
Viola adunca
USDA Symbol:
VIAD

Growth Characteristics

Life Cycle:
Perennial
Growth Habit:
Forb/herb
Height:
15 cm
Light Requirements:
Shade
Drought Tolerance:
Medium
Bloom Months:
mar,apr,may,jun,jul,aug
Bloom Colors:
purple, violet, blue
Ground Cover:
Yes

Wildlife Benefits

Bees:
★☆☆☆☆ Documented bee visitation (GBIF)
Butterflies & Moths:
★☆☆☆☆ Documented Lepidoptera association (GBIF)
Caterpillars:
★★☆☆☆ Recorded caterpillar host plant (HOSTS Database)

Keystone Species Ranking

Caterpillar Keystone:
★★★☆☆ Butterfly & moth species supported by this genus (NWF)
Pollen Specialist Bee Keystone:
★★★★★ Native pollen specialist bee species supported by this genus (NWF)

Host Plant for Caterpillars

Atlantis fritillary (Speyeria atlantis), ⚠️Bog Fritillary (Clossiana eunomia), Edwards' fritillary (Speyeria edwardsii), Great Basin fritillary (Speyeria egleis), Great Spangled Fritillary (Speyeria cybele), Hydaspe fritillary (Speyeria hydaspe), Mormon fritillary (Speyeria mormonia), Titania's fritillary (Clossiana titania), 🛑Zerene fritillary (Speyeria zerene)

Garden & Ecology Notes

Wildlife Value:
butterflies, bees
Deer Resistant:
Yes
Fragrant:
Yes
Fire Ecology:
Fire adapted — tolerates or benefits from fire
Fire Notes:
Resprouts from rootstock following fire; often increases in abundance in early post-fire communities.

Soil Requirements

Soil Type:
rich, well-drained loamy soil
pH:
5.5 - 7.0 (slightly acidic to neutral)
Drainage:
excellent drainage required
Moisture:
consistently moist
Notes:
prefers open woods and meadows

Propagation & Germination

Stratification:
Cold/moist stratification required — 30–90 days
Germination Time:
14–60 days
Notes:
Seeds require light for germination. Fresh seed germinates more readily than stored seed.

The above propagation data sourced from Claude AI

Pre-treatment: 120 days of cool (38F)/moist stratification

Source: npn.rngr.net

ORGHPS Germination Guide: Sow @ 4C for 3 months, then place @ 20C for 3 months.

Source: Ontario Rock Garden & Hardy Plant Society