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Linaria canadensis - (L.)Dum.Cours.

Common Name Blue Toadflax
Family Scrophulariaceae
USDA hardiness 4-8
Known Hazards None known
Habitats Dry sterile or sandy soils, often a weed in sandy loams[43].
Range N. America - Nova Scotia to Florida, west to Minnesota, Oregon, Texas and California
Edibility Rating    (0 of 5)
Other Uses    (0 of 5)
Weed Potential No
Medicinal Rating    (1 of 5)
Care (info)
Fully Hardy Well drained soil Moist Soil Full sun
Linaria canadensis Blue Toadflax


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Linaria canadensis Blue Toadflax
http://www.flagstaffotos.com.au/gallery2/main.php

 

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Summary


Physical Characteristics

 icon of manicon of flower
Linaria canadensis is a ANNUAL/BIENNIAL growing to 0.6 m (2ft).
See above for USDA hardiness. It is hardy to UK zone 4. The species is hermaphrodite (has both male and female organs).
Suitable for: light (sandy) and medium (loamy) soils, prefers well-drained soil and can grow in nutritionally poor soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils. It cannot grow in the shade. It prefers dry or moist soil and can tolerate drought.

UK Hardiness Map US Hardiness Map

Synonyms

Plant Habitats

 Cultivated Beds;

Edible Uses

None known

References   More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.
Antihaemorrhoidal  Diuretic  Laxative

The leaves are antihaemorrhoidal, diuretic and laxative[61, 254]. They are applied externally in the treatment of haemorrhoids[254].

References   More on Medicinal Uses

Other Uses

None known

Special Uses

References   More on Other Uses

Cultivation details

A very drought resistant plant once established, it thrives in a poor gravelly soil[200]. Nitrogen-rich soils produce excessive leaf growth at the expense of flowering[200]. Prefers a sunny position[200].

References   Carbon Farming Information and Carbon Sequestration Information

Temperature Converter

Type a value in the Celsius field to convert the value to Fahrenheit:

Fahrenheit:

Plant Propagation

Seed - sow spring in situ[200]. An autumn sowing can also be made in areas with mild winters[200]. This sowing will produce larger plants.

Other Names

If available other names are mentioned here

Native Range

NORTHERN AMERICA: Canada (Québec, Nova Scotia, Ontario), United States (Connecticut, Indiana, Maine, Massachusetts, Michigan, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, Iowa (east), Kansas, Minnesota (southeast), Missouri, Nebraska, South Dakota, Illinois, Oklahoma, Wisconsin, Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, North Carolina, South Carolina, Tennessee, Virginia, Texas)

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it's worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

IUCN Red List

Related Plants
Latin NameCommon NameHabitHeightHardinessGrowthSoilShadeMoistureEdibleMedicinalOther
Castilleja linariaefoliaWyoming Indian PaintbrushPerennial0.6 4-8  LMHSNM121
Linaria vulgarisYellow Toadflax, Butter and eggsPerennial0.6 4-8  LMHSNDM123

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

 

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Expert comment

Author

(L.)Dum.Cours.

Botanical References

4350200

Links / References

For a list of references used on this page please go here

Readers comment

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Subject : Linaria canadensis  
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