Blue Toadflax, Old-field Toadflax, Canada Toadflax
Nuttallanthus canadensis

Family: Plantaginaceae
Genus: Nuttallanthus (nut-al-ANTH-us) (Info)
Species: canadensis (ka-na-DEN-sis) (Info)
Synonym:Linaria canadensis

Category:

Biennials

Perennials

Height:

6-12 in. (15-30 cm)

12-18 in. (30-45 cm)

18-24 in. (45-60 cm)

Spacing:

6-9 in. (15-22 cm)

Hardiness:

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)

Sun Exposure:

Full Sun

Danger:

Parts of plant are poisonous if ingested

Bloom Color:

Blue-Violet

Violet/Lavender

Bloom Time:

Mid Spring

Late Spring/Early Summer

Mid Summer

Late Summer/Early Fall

Mid Fall

Foliage:

Shiny/Glossy-Textured

Other details:

May be a noxious weed or invasive

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

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

Soil pH requirements:

5.6 to 6.0 (acidic)

Patent Information:

Non-patented

Propagation Methods:

By dividing the rootball

From seed; direct sow outdoors in fall

From seed; sow indoors before last frost

From seed; direct sow after last frost

Seed Collecting:

Bag seedheads to capture ripening seed

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

Regional

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

Lexa, Arkansas

Fernandina Beach, Florida

Cornelia, Georgia

Monroe, Georgia

Lake Charles, Louisiana

Bridgewater, Massachusetts

Worcester, Massachusetts

Saint Helen, Michigan

show all

Gardeners' Notes:

0
positives
1
neutral
0
negatives
RatingContent
Neutral

On Jul 13, 2003, bsarg from Worcester, MA (Zone 6a) wrote:

The tiny blue flowers of this plant have a 2-humped white palate and a long slender spur projecting underneath, in a slender raceme.The narrow leaves are linear and shining.It prefers dry sandy soil.It is a native plane and while lovely in the wild I do not think it showy enough to plant it in the garden.