Tiarella 'Iron Butterfly'

Tiarella 'Iron Butterfly' in bloom in a shaded woodland
Tiarella 'Iron Butterfly'

Cultivar of the Saxifragaceae family, obtained through horticultural selection from North American species of the genus Tiarella, with which it shares its requirements and general habit. It is a woodland perennial, cultivated for the persistent quality of its foliage as well as for its spring flowering.

The plant forms a compact, non-stoloniferous clump, reaching 25 to 35 cm in height when in bloom. The foliage is one of its most distinctive features: the leaves are deeply cut, almost palmatilobed, of a medium to dark green, traversed by a very distinct purple-brown central marking that follows the main veins and gives each leaf a contrasting pattern, visible in all seasons.

The floral stems, slender and upright, bear narrow and dense spikes of small pinkish-white to slightly lilac-pink flowers, with protruding stamens that give them the airy character typical of the genus. Flowering in cultivation generally occurs in April-May.

This cultivar is distinguished from Tiarella cordifolia by its uncommon habit, its tighter clump, and especially by the intensity of the foliar marking, which persists and enriches in autumn with bronzed hues.

It requires a cool, humus-rich, well-drained soil, in shade or partial shade, without prolonged summer drought. Suitable for woodland gardens, shaded borders, and associations with ferns, primroses, and dwarf daylilies.