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Amorphophallus hirsutus Teijsm. & Binn.

Introduction & Overview

Common and Scientific Names

  • Scientific Name: Amorphophallus hirsutus
  • Common Name: Hairy Titan Arum

Quick Facts

  • Origin: Native to the tropical rainforests of Southeast Asia
  • Features: Large, hairy spathe and striking foliage; it thrives in humid, warm environments and has a notable presence in both botanical collections and natural habitats

Taxonomy & Classification

  • Genus: Amorphophallus
  • Botanical Background: Described by Teijsmann and Binnendijk in the 19th century, with its distinct features helping it to stand out among other species in the genus.

Natural Habitat & Distribution

  • Geographical Range: Found in the tropical forests of Southeast Asia, including regions of Indonesia, Malaysia, and surrounding islands
  • Environment: Humid, shaded environments, typically at low to mid-elevations in well-drained, fertile soils; prefers consistently warm temperatures and high humidity, often found in regions with a seasonal monsoon climate.

Morphological Characteristics

Leaves

  • Large, with a deep green coloration
  • Compound, with leaflets that have a leathery texture
  • Elongated shape and reaching impressive lengths

Inflorescence (Spadix & Spathe)

  • Composed of a tall, thick spadix surrounded by a large, hairy spathe that is dark purple
  • Scent not particularly strong

1Growth Habit

  • A terrestrial plant that grows from a tuber
  • Not epiphytic or climbing
  • Can reach substantial heights during its growing phase

Cultivation & Care

Light Requirements

  • Prefers indirect, filtered light or dappled shade

Watering & Humidity

  • Regular watering is essential to maintain moisture
  • It is important to allow the soil to dry slightly between waterings
  • Benefits from high humidity, ideally between 60-80%

Soil & Potting Mix

  • Requires well-draining, loamy soil enriched with organic material
  • A mix of peat and perlite or orchid bark works well

Temperature & Fertilizer

  • Ideal temperature range is 24-30°C (75-86°F)
  • Balanced liquid fertilizer can be applied every 2-3 weeks to encourage healthy growth

Propagation Methods

Division and Stem Cuttings

  • Division of the tuber
  • Each section should have a viable bud or growing point

Seeds

  • Not commonly available
  • Germination can be slow and requires warm, moist conditions

Common Pests & Diseases

Typical Issues

  • Aphids, scale, and mealybugs
  • Root rot

Treatment Recommendations

  • Organic insecticidal soap or neem oil can be effective for pest control
  • Ensure the plant is in well-drained soil
  • Fungicides may be necessary for severe fungal infections

Notable Traits & Uses

  • Impressive size and unique appearance of its inflorescence, making it a subject of interest for collectors and botanical enthusiasts
  • Striking appearance and rarity
  • A valuable addition to collections of aroids or tropical plants

Conservation & Availability

Wild Population Status

  • No immediate threats to the species' population
  • Faces pressure from habitat loss

Market Availability

  • Not commonly found in general plant markets
  • Available through specialty nurseries or botanical collections

References & Resources

Further Reading

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