Bulbous perennial of the Iridaceae family, Crocus etruscus is an endemic species of central Italy, mainly Tuscany and Lazio, where it grows in dry meadows, open garrigues and wooded edges on calcareous or volcanic substrate, at low and medium altitude. The 'Zwanenburg' cultivar is a selection from, once again, the collections of the Van Tubergen nursery.
The flowers are of a lilac to medium lavender hue, with well-marked purple-violet veins on the outer tepals, giving them a visual texture similar to that of embroidered fabric. The inside of the flower is a paler lilac, almost silvery, while the stamens are bright yellow and the stigmas are cut orange, forming a bright heart that stands out clearly against the light background of the tepals. The leaves, narrow and linear with the typical white median line, appear at the same time as the flowers.
In its natural habitat, the species blooms from February to March. In cultivation, 'Zwanenburg' blooms at the same time, sometimes as early as the end of January depending on the winters, making it one of the earliest lavender crocuses available in horticulture.
It requires well-drained, light soil, in a sunny exposure, with a dry summer rest respected. It is perfectly suited to rock gardens, gravel gardens, and borders with mineral substrate.