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Spacing: 18-24 in. (45-60 cm) 24-36 in. (60-90 cm)
Hardiness: 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) USDA Zone 9b: to -3.8 °C (25 °F)
Sun Exposure: Full Sun
Danger: N/A
Bloom Color: Bright Yellow
Bloom Time: Late Spring/Early Summer Mid Summer Late Summer/Early Fall
Foliage: Herbaceous Smooth-Textured
Other details: May be a noxious weed or invasive Average Water Needs; Water regularly; do not overwater Self-sows freely; deadhead if you do not want volunteer seedlings next season
Soil pH requirements: 6.1 to 6.5 (mildly acidic) 6.6 to 7.5 (neutral) 7.6 to 7.8 (mildly alkaline) 7.9 to 8.5 (alkaline)
Patent Information: Non-patented
Propagation Methods: By dividing the rootball From softwood cuttings From seed; direct sow outdoors in fall From seed; winter sow in vented containers, coldframe or unheated greenhouse
Seed Collecting: Allow pods to dry on plant; break open to collect seeds
On Jul 30, 2008, daryl from vernon, BC (Zone 6a) wrote:
The name toadflax is thought to result from a mistake.It seems that the common toadflax may have been used to treat 'buboes' (boils) and was known as bubinio,meaning 'toad',and from then on the plant became associated with toads.The genus name Linaria refers to the general similarity of the leaves of species in the genus to those of flax(linum sp.).The species name genistifolia reflects the resemblance of the leaves to those of broom (genista sp.).Dalmation toadflax was originally given the scientific name L. dalmatica because it is thought to come from Dalmatia(on the eastern Adriatic coast).
On Apr 1, 2007, Joan from Belfield, ND (Zone 4a) wrote:
This plant is listed on the North Dakota invasive/troublesome list and this information is being distributed in a guide developed by the ND Weed Control Association and other agencies.
Plant Features
Perennial, up to 3 feet tall
Leaves and stems blue-green
Leaves heart-shaped, thick, waxy, clasp around stem
Bright yellow snapdragon-like flowers with a bright orange throat and long yellow spur
Spreads by creeping roots (rhizomatous) and seed
Distribution
Documented in a few areas. Very aggressive, can grow under most conditions, but prefers dry sandy to gravelly soils
Very difficult to eradicate
Interesting Facts
Gardeners call it butter-and-eggs
Flowers resemble yellow toadflax
A single plant can product up to a half-million seeds per year
Commonly found in cemeteries, originally planted as an ornamental
Widespread invasive in western U.S.
On Oct 13, 2005, TuttiFrutti from Spokane Valley, WA (Zone 5b) wrote:
While this is, indeed, quite a prolific plant here in the Inland Northwest, I must admit that I'm rather fond of its blue-green foliage and bright yellow spurred flowers.
It is very easy to identify when it appears in my yard. It is equally easy to pull up to become part of my compost bin before it ever goes to seed.
On Jun 18, 2005, llebpmac_bob from Zephyr Canada wrote:
Looks suspiciously like a common roadside weed here in Ontario too. As it is already common in my area I leave a few plants in the garden. It's quite attractive for a noxious weed.
Has glaucous, lance shaped or ovate leaves. Bears 2 lipped, yellow flowers with a conspicuous spur. They differ from L. genistifolia by having shorter leaves and larger (up to 2 inches long) flowers.
Flowers June-September
Loves a well-drained (preferably slightly alkaline) soil in full sun.
Will self-sow easily and can become a pest.
Regional...
This plant has been said to grow in the following regions:
