Plant Type:
Herbaceous biennial
Melanoselinum decipiens, or Madeira Giant Black Parsley, is a striking, short-lived perennial from Madeira. It forms a rosette of large, glossy, divided leaves atop sturdy stems, reaching 1.5-2.5m. After 2+ years, it produces large umbels of pinkish flowers, followed by black seeds, before dying. It thrives in moist, well-drained soil in sun or partial shade.
Cold Hardiness:
Hardy
Melanoselinum decipiens is considered borderline hardy in the UK. It may survive in milder, coastal regions (possibly down to -5°C or RHS hardiness H3). However, in colder inland areas, it’s likely to need winter protection, such as a thick mulch or growing in a sheltered spot to survive.
Eventual Height:
1.5-2.5m
Melanoselinum decipiens, or Madeira Giant Black Parsley, typically reaches a mature height of 1.5 to 2.5 metres (5 to 8 feet). This impressive, short-lived perennial develops a sturdy, often bamboo-like stem topped with a rosette of large, divided leaves.
Light requirements:
Full Sun – Partial Shade
Melanoselinum decipiens thrives in full sun to partial shade. While it can tolerate some shade, especially in the hottest part of the day, it generally prefers at least 6 hours of direct sunlight daily for optimal growth and the best chance of flowering. A sheltered spot is also beneficial.
Water Requirements:
Moderate
Melanoselinum decipiens prefers consistently moist but well-drained soil. Water regularly, especially during active growth, allowing the top inch to slightly dry out between waterings. Reduce watering in winter. Ensure good drainage as it dislikes winter wet.
Caring for this plant:
Spring & Summer: In spring, as new growth emerges, provide Melanoselinum decipiens with well-drained soil and a sheltered spot in sun or partial shade. Water moderately, allowing the topsoil to dry slightly between waterings. In summer, maintain consistent moisture, especially during hot periods. This plant typically flowers after a couple of years, then sets seed and dies. Enjoy its architectural foliage!
Autumn & Winter:In autumn, as temperatures cool in the UK, Melanoselinum decipiens foliage may decline. It dislikes winter wet, so ensure well-drained soil. A mulch can offer some protection. Being borderline hardy (H3-H4), in colder winters, consider wrapping the crown or moving potted plants to a sheltered location to prevent frost damage. It often dies after flowering, but is likely to self-seed.
