Xanthosoma sizemoreae Croat & Delannay

• Genus: Xanthosoma
• Botanical Background: 

  Described by Thomas B. Croat and Félix Delannay, this species was named in honor of botanist Leland Sizemore for his contributions to aroid research and field collection.

• Geographical Range: Endemic to Peru
• Environment: Grows in humid, shaded forest understories where the soil is rich in organic material. It favors high rainfall zones with consistent moisture and minimal light fluctuation.

Leaves

• Large, sagittate leaves with a glossy surface and a deep green hue
• Lobes are broad and pointed, giving the plant an imposing yet elegant tropical appearance

Inflorescence (Spadix & Spathe)

• Inflorescence includes a cylindrical spadix and a surrounding spathe that may be green or whitish
• Pollinated by small beetles or flies attracted to the scent and warmth

Growth Habit

• Terrestrial herbaceous plant with a rhizomatous or tuberous base
• Forms clumps and can reach considerable size in mature specimens

Light Requirements

• Bright, indirect light
• Direct sun may cause leaf burn

Watering & Humidity

• Requires regular watering and consistently moist soil
• High humidity (above 70%) is ideal for maintaining leaf health and preventing browning

Soil & Potting Mix

• Prefers well-draining, fertile soil rich in organic matter
• Mix of loam, compost, and perlite or bark chips is recommended for potted cultivation

Temperature & Fertilizer

• Best suited to temperatures between 20–28°C (68–82°F)
• Apply a balanced liquid fertilizer every 4–6 weeks during the growing season

Division

• Propagated by dividing rhizomes or tubers
• Ensure each section has healthy roots and a growing point

Seeds

• Propagation is possible but infrequent in cultivation
• Require a warm, humid environment and may take weeks to germinate

Typical Issues

• Mealybugs and aphids
• Poor air circulation or soggy soil can lead to fungal infections or root rot

Treatment Recommendations

• Use neem oil or horticultural soap for insect control
• Avoid overwatering and ensure good drainage to minimize disease risk

• Named after Leland Sizemore
• Highlights the botanical richness of Peru's Amazon basin and remains little known outside of specialist circles

• Appreciated for its bold, tropical foliage and suitability as a landscape plant in warm climates
• Large specimen in controlled greenhouse environments

Wild Population Status

• Not assessed by the IUCN
• Susceptible to habitat loss from deforestation

Market Availability

• Very rare in cultivation
• Not commonly available through commercial nurseries
• Sourced mainly through botanical gardens or specialized collectors