Xanthosoma rubrispathum E.G.Gonç.

• Genus: Xanthosoma
• Botanical Background: Described by Eduardo G. Gonçalves, a specialist in Neotropical Araceae, the species name “rubrispathum” refers to the red-colored spathe that distinguishes it from closely related species.

• Geographical Range: Native to Brazil
• Environment: Prefers humid, shaded environments with consistent moisture. Typically found near forest understories or riparian zones with rich, organic soils.

Leaves

• Large, arrow-shaped, and vibrant green with smooth margins and a soft, somewhat glossy surface
• Venation is prominent, especially on mature leaves

Inflorescence (Spadix & Spathe)

• Reddish spathe surrounding a pale yellow or cream spadix
• Pollinated by beetles or other insects, though specific pollination ecology is not well studied

Growth Habit

• Terrestrial, tuberous species that forms upright clumps
• Does not climb or form aerial roots and is rooted in the soil via thick underground tubers

Light Requirements

• Bright; indirect light
• Direct sunlight should be avoided to prevent leaf burn

Watering & Humidity

• Requires regular watering to maintain evenly moist soil
• High humidity is ideal, especially in indoor settings or greenhouses

Soil & Potting Mix

• Thrives in a well-aerated mix rich in organic matter
• Use a blend that retains moisture without becoming waterlogged, such as peat, compost, and perlite

Temperature & Fertilizer

• Optimal temperature range is 22–30°C (72–86°F)
• Fertilize monthly during the growing season using a balanced or nitrogen-rich liquid fertilizer

Division

• Propagated through division of its underground tubers
• Division should include a visible growing point or eye

Seeds

• Propagation is rare and not commonly practiced
• Viability and germination behavior remain underdocumented

Typical Issues

• Spider mites, aphids, and mealybugs
• Overwatering can lead to tuber rot or fungal infections

Treatment Recommendations

• Use insecticidal soap or neem oil for pest control
• Prevent disease by ensuring adequate drainage
• Avoiding waterlogged conditions

• Red coloration of the spathe is rare among Xanthosoma species
• Special interest to botanists and collectors

• Bold foliage and red-toned inflorescence
• Suitable for tropical garden displays or as a statement plant in conservatories

Wild Population Status

• Limited known distribution and potential habitat threats
• Face conservation risks, though it has not been formally assessed for IUCN status

Market Availability

• Extremely rare in cultivation
• Generally limited to botanical collections or specialized growers