Hoya clemensiorum 'Kalimantan' (Clone 1) – Rare Collector Form from Indonesian Borneo
Hoya clemensiorum 'Kalimantan' (Clone 1) is a rare regional form of Hoya clemensiorum (T.Green), collected from the Kalimantan region of Indonesian Borneo. This slow-growing epiphyte is prized for its striking venation, where deep green vascular lines create dramatic contrast against a lighter green background. With its thick, lance-shaped leaves and climbing growth habit, this form is a favorite among serious Hoya collectors seeking bold texture and tropical authenticity.


Why Hoya clemensiorum 'Kalimantan' Stands Out


 
Bold Leaf Pattern: Leathery, lanceolate leaves up to 20 cm long with pronounced dark green veining over pale green blades.
 
Climbing Epiphyte: Naturally climbs using aerial roots. Ideal for trellises, moss poles, or suspended setups.
 
Slow but Steady Growth: This clone takes its time but rewards patience with stunning mature foliage.
 
Flowering Potential: Produces small, star-shaped umbels with a mild scent. Flowering indoors is rare and may take years.
 
Regional Identity: The “Kalimantan” designation refers to its collection in Indonesian Borneo, suggesting localized traits.


Indoor Care for Hoya clemensiorum 'Kalimantan'


 
Light: Bright, indirect light helps maintain strong venation. Avoid full sun, which can damage foliage.
 
Watering: Allow the top 2 – 3 cm of substrate to dry between waterings. Use breathable pots and well-draining soil.
 
Humidity: Performs best at 60 – 80%. Growth slows under 50%. Avoid misting directly onto leaves.
 
Temperature: Keep within 18 – 26 °C. Protect from cold drafts and avoid temperatures below 15 °C.
 
Substrate: Use a chunky mix of orchid bark, perlite, coco coir, and pumice. Excellent drainage is essential.
 
Fertilizer: Feed once a month with a diluted balanced liquid fertilizer. No seasonal adjustments needed.


How to Avoid Common Problems


 
Yellow Leaves: Usually from overwatering or poor airflow. Allow drying time and increase circulation.
 
Drooping Foliage: Can be a response to underwatering or cold stress. Check substrate moisture and room temperature.
 
Root Issues: Prevent rot by using a loose, airy mix. Never let the pot sit in water.
 
Pests: Monitor for spider mites and mealybugs. Treat with neem oil, insecticidal soap, or biological controls.


Additional Growing Tips


 
Support Structures: Use a moss pole or trellis to encourage upright growth and larger leaves.
 
Pruning: Remove weak or leggy stems to focus energy on stronger growth points.
 
Repotting: Only when root-bound. Use a container just slightly larger than the root mass.


Etymology and Clone Origin


The genus Hoya honors English botanist Thomas Hoy. The species name clemensiorum uses the Latin genitive plural to recognize Joseph and Mary Strong Clemens, who collected extensively in Borneo. “Kalimantan” refers to the Indonesian part of Borneo, where this specific clone was collected, distinguishing it from other regional variants.
Want to grow one of the most distinct Hoyas from Southeast Asia? Add Hoya clemensiorum 'Kalimantan' (Clone 1) to your collection and enjoy its bold texture and slow, rewarding growth!