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A perennial of the Plantaginaceae family, the common toadflax is native to Europe and temperate Asia, now naturalized in much of the world. It occupies roadsides, embankments, wastelands, fields, and vacant lots, on well-drained substrates, dry to fresh, indifferent to soil nature.
It forms erect and branched clumps, reaching 30 to 80 cm in height, with narrow linear foliage, glaucous green, dense on the stems. The flowers, arranged in tight terminal spikes, are bicolored: the corolla is pale yellow to cream yellow, sometimes slightly greenish, with a palate of bright orange-yellow to pure orange, distinctly bulging and very visible. The spur, thin and elongated, is of the same hue as the corolla. The structure resembles that of a miniature snapdragon, and the orange palate functions as a landing signal for bumblebees, the only insects robust enough to force the flower open.
In its natural habitat, its flowering extends from June to October. In cultivation, it can start as early as May in sunny situations.
It spreads easily by stolons and can become invasive in light soils. Formerly used in folk medicine as a diuretic and purgative, it was also employed to dye fabrics yellow. It is suitable for natural gardens, flowering embankments, and compositions with a wild character, in full sun and well-drained soil.