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

Nuttallanthuscanadensis

Genus
Nuttallanthus (nut-al-ANTH-us)
Species
canadensis (ka-na-DEN-sis)
Synonym
Antirrhinum canadense
Sun Exposure
Full Sun
Foliage
Textured
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)
Danger
Parts of plant are poisonous if ingested
Bloom Color
Blue-Violet
Lavender
Bloom Time
Mid Spring
Late Spring/Early Summer
Mid Summer
Late Summer/Early Fall
Mid Fall
Other Details
Category
Biennials
Perennials
Water Requirements
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Foliage Color
Where to Grow
Bloom Characteristics
This plant is attractive to bees, butterflies and/or birds
Bloom Size
Other details
May be a noxious weed or invasive
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 is said to grow outdoors in the following regions:

Lexa, Arkansas

Fernandina Beach, Florida

Cornelia, Georgia

Guyton, Georgia

Monroe, Georgia

Rockford, Illinois

Lake Charles, Louisiana

Bridgewater, Massachusetts

Worcester, Massachusetts

Saint Helen, Michigan

Conway, South Carolina

Leesburg, Virginia

show all

Featured Videos

Gardener's Notes:

2
positives
1
neutral
0
negative
Sort By:
Sort By:
T
Guyton, GA | April 2018 | positive

A favorite invasive yard weed among southern Georgia (Chatham/Effingham Co) children to pick and give to their mama’s. Comes up wild, t...Read More

B
B
Rockford, IL | June 2017 | positive

Lovely in the native plantings among the coreopsis currently in bloom on the parkside in front of my house.

B
B
Worcester, MA (Zone 6a) | July 2003 | neutral

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 n...Read More

Featured
Tiger Crane Fly
(Nephrotoma sp.)
Moorhen
(Gallinula chloropus)
Featured
Tiger Crane Fly
(Nephrotoma sp.)
Moorhen
(Gallinula chloropus)