Fauna
Plant

Siebold's Plantain Lily

Hosta sieboldiana

Also known as Giant Plantain Lily, Siebold's Hosta, Blue Plantain Lily

Siebold's plantain lily forms massive, architectural mounds of deeply puckered, blue-green foliage that anchor temperate shade gardens. Broad, heart-shaped leaves feature a waxy glaucous coating that repels water droplets while shading the plant from intense sun. In midsummer, tall flowering scapes rise above the dense canopy to display dense clusters of pale lavender to near-white bell-shaped blooms.

Shade PlantPerennialOrnamental
Siebold's Plantain Lily reference1 / 7
(c) Marco Mussita, some rights reserved (CC BY), uploaded by Marco Mussita · cc-by
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyAutotrophic (Photosynthetic)
Predators
  • Grey Slugs
  • Garden Snails
  • White-tailed Deer
ThreatsSlugs, snails, white-tailed deer, and foliar nematodes
HabitatsMontane forests, rocky slopes, moist woodland valleys, and shade gardens
Life span30+ years
Classification
  1. OrderAsparagales
  2. FamilyAsparagaceae
  3. GenusHosta
  4. SpeciesHosta sieboldiana
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is high
Contains saponins toxic to dogs and cats if ingested; safe for humans to handle and observe.
Why it is dangerous
Contains saponins that break down cell membranes, causing severe gastrointestinal upset, vomiting, and lethargy in domestic pets.
How to recognize a risky encounter
Look for huge, chalky blue-green leaves with deep corrugated veins forming rounded shade-dwelling clumps.
What to do
Keep dogs and cats away from garden plantings and ensure pets do not chew on fallen leaves.
Responsible observation
  • Shade Placement: Position in partial to dense shade to preserve the powdery blue leaf coating from sun scorch.
  • Pest Control: Inspect the undersides of the broad foliage early in spring to deter emerging slugs and snails.
Related species
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