Petasites pyrenaicus
winter heliotrope
Central Mediterranean and North Africa
Overview
Petasites pyrenaicus, winter heliotrope and long known as Petasites fragrans, is a rhizomatous evergreen perennial in the daisy family (Asteraceae) grown for its scented winter flowers and ground-covering foliage. From late autumn into early spring it produces loose spikes 8-16 inches (20-40 cm) tall of pale lilac-pink flower heads that carry a sweet vanilla scent. The rounded, kidney-shaped leaves are 4-8 inches (10-20 cm) across, green on both surfaces, and held on long stalks, forming a dense carpet that shades out smaller plants. It spreads by thick, fast-creeping rhizomes, and in much of its naturalized range every plant is a male clone that sets no seed, so it advances entirely by root. The plant grows along roadsides, riverbanks, ditches, and damp shaded ground, building wide, persistent colonies. The rhizomes regrow from the smallest fragment, making the plant invasive and very difficult to remove once established. It tolerates sun or shade on most moist soils and is hardy in mild-winter regions. The leaves and rhizomes contain pyrrolizidine alkaloids and are toxic if eaten.
Native Range
Native to the central Mediterranean and North Africa, including Italy, Sardinia, Sicily, and parts of the Maghreb, where it grows in damp, shaded ground. It has naturalized widely across Britain, Ireland, and western Europe, where it is treated as an invasive weed of roadsides and waterways.Suggested Uses
Grown as winter-flowering groundcover in large wild gardens, on shaded banks, and in damp rough ground where its scent and early flowers are wanted. Used to cover and stabilise difficult moist, shaded sites that resist other plants. Its aggressive rhizomes make it unsuited to small gardens, borders, or any setting near open countryside.How to Identify
Appearance
Size & Dimensions
Height8" - 1'4"
Width/Spread2' - 4'
Bloom Information
Flowering runs through winter, from about November to March, well ahead of most garden plants. The vanilla-scented lilac-pink spikes draw the few bees and flies active on mild winter days. In naturalized male colonies no seed forms, and the display fades as the leaves expand into spring.
Detailed Descriptions
Foliage Description
greenGrowing Conditions
Sun Requirements
Requires 3-7 hours of direct sunlight daily
• Full Sun: 6+ hours of direct sunlight
• Partial Shade: 3-6 hours of direct sunlight
• Full Shade: Less than 3 hours of direct sunlight