Horticultural selection of Chaix's mullein, a perennial from the Scrophulariaceae family, this cultivar stands out from the type species by its particular floral hue and its very branched habit producing many upright stems simultaneously, hence its evocative name.
It forms vigorous clumps of oval-lanceolate leaves, slightly grayish and soft to the touch, from which multiple well-erected spikes rise each summer reaching 80 to 120 cm. The flowers, paler than those of the type species, are a bright sulfur yellow to lemon yellow, with five well-spread petals, with a center formed of stamens with filaments covered in bright red-purple hairs and orange anthers. This contrast between the light corolla and the dark, colorful center is particularly striking up close, and gives the whole a lightness that denser-flowered mulleins do not have.
In cultivation, blooming occurs from June to August, with generous and prolonged production when the first faded stems are removed. It requires well-drained soil, even poor, in full sun, and tolerates summer drought well once established. A faithful perennial, it reseeds moderately and can over time form beautiful naturalistic colonies.