Spathantheum orbignyanum Schott

• Genus: Spathantheum
• Botanical Background: First described by Heinrich Wilhelm Schott in 1859 (Bonplandia 7:165).

• Geographical Range: Indigenous to seasonally dry tropical biomes at 2,000–3,000 m elevation in Peru, Bolivia, and NW Argentina.
• Environment: Thrives in cool, dry‑temperate grasslands with excellent drainage and high humidity during growing season.

Leaves

• Large, glossy, ovate‑lanceolate leaves (20–40 cm long), dark green, smooth texture

Inflorescence (Spadix & Spathe)

• Green spathe (~5–7 cm long) surrounding a compact orange‑yellow spadix
• Minimal fragrance
• Likely pollinated by small insects attracted to color contrast

Growth Habit

• Terrestrial, tuberous geophyte with seasonal dormancy in winter

Light Requirements

• Bright, indirect light 
• Tolerates some morning sun

Watering & Humidity

• Moderate watering during growth; keep soil barely moist
• Reduce watering during winter dormancy
• Humidity ≥50%

Soil & Potting Mix

• Free‑draining mix (peat, perlite, coarse sand)
• Clay or ceramic pot with drainage holes

Temperature & Fertilizer

• Optimal range: 10–25 °C
• Feed monthly with balanced liquid fertilizer during active growth

Division and Cuttings

• Division of tubers in early spring is most reliable

Seeds

• Rarely used
• Fresh seed germination in moist medium at ~20 °C
• Low viability reported

Typical Issues

• Susceptible to root rot (overwatering), mealybugs, spider mites

Treatment Recommendations

• Improve drainage for rot
• Neem oil or insecticidal soap for pests
• Systemic insecticide if severe

• Inflorescence resembles corn ear

• Dormant tuber adapts to seasonal dryness

• Valued for exotic foliage and unusual inflorescence
• Ideal for cool‑climate shade gardens

Wild Population Status

• Predicted “not threatened” (Angiosperm Extinction Risk Predictions) 

Market Availability

• Rare but occasionally available through specialist nurseries