Hoya 'Puom Siam Ruby' – Thai Hybrid with Ruby-Edged Foliage and Sculptural Texture

Hoya 'Puom Siam Ruby' (PMP 176) is a rare hybrid developed in Thailand from a cross between Hoya 'Joy' and Hoya 'Jennifer'. Known for its sculpted, veined foliage and deep red-to-purple margins, this slow-growing Hoya stands out in any collection. Compact, easy to care for, and bloom-capable with patience, it’s a must-have for collectors who appreciate foliage drama and structural beauty in one plant.
Quick Facts – Hoya 'Puom Siam Ruby'
 
Hybrid: H. 'Joy' × H. 'Jennifer' (Thailand, PMP 176)
 
Leaf Traits: Thick, glossy leaves with raised veins and dark ruby edges
 
Growth Habit: Compact climber or trailer; up to 100 cm with support
 
Blooms: Star-shaped white-pink flowers with red coronas, lightly scented
 
Pet Safety: Non-toxic, but contains latex sap
Why Collectors Love Hoya 'Puom Siam Ruby'
This hybrid’s deep texture, contrast-rich leaf margins, and compact form make it ideal for shelf or hanging displays. Under bright indirect light, the red pigmentation intensifies, offering dynamic visual interest. While it may take time to bloom, the flowers reward patient growers with delicate clusters and a subtle evening fragrance.
How to Keep Hoya 'Puom Siam Ruby' Thriving
 
Light: Needs bright, indirect light. Tolerates gentle morning sun but avoid hot afternoon rays.
 
Watering: Water when the top 2 – 3 cm of soil is dry. Reduce frequency in low light or cool temps.
 
Humidity: Prefers 60 – 80% but adapts to 50%+. Boost with trays or a humidifier if needed.
 
Temperature: Optimal range: 18 – 25 °C. Protect from sudden drops below 15 °C.
 
Soil Mix: Use a chunky, airy substrate: orchid bark, perlite, and coco coir or light aroid mix.
 
Fertilizing: Feed monthly with a balanced liquid fertilizer. No seasonal adjustment needed.
 
Potting: Allow to stay slightly root-bound. Repot only every 2 – 3 years or when roots circle the base.
Flowering Tips and Propagation Notes
 
Blooms: May take 2 – 3 years to flower indoors. Consistent light and pot-tight roots are key.
 
Peduncle Care: Never cut flower stalks after blooming — Hoyas rebloom from the same peduncles.
 
Propagation: Use 1 – 2 node stem cuttings. Root in perlite, water, or moss with steady warmth and humidity.
 
Growth Speed: Slow to moderate; faster in higher humidity and stable conditions.
Common Issues (And How to Solve Them)
 
Yellowing Leaves: Usually from overwatering. Improve drainage and reduce frequency.
 
Leaf Curling: Indicates underwatering or dry air. Check soil moisture and boost humidity.
 
Pests: Susceptible to mealybugs and mites. Treat early with neem oil or insecticidal soap.
 
Root Rot: Prevent with airy soil and breathable pots. Repot and remove mushy roots if detected.
Is Hoya 'Puom Siam Ruby' Safe for Pets?
 
Non-Toxic: Safe for cats and dogs if touched, but not edible. Keep out of reach to avoid chewing.
 
Latex Warning: When pruned, the plant exudes a sticky white sap. Use gloves if you're latex-sensitive.
Where the Name Comes From
The genus Hoya honors English botanist Thomas Hoy (1750 – 1822), a pioneer in tropical plant cultivation. ‘Puom Siam Ruby’ likely refers to its Thai nursery origin (‘Puom’), national reference (‘Siam’), and the vivid red tones in its leaves (‘Ruby’). PMP 176 is its collector or grower reference code.
Frequently Asked Questions – Hoya 'Puom Siam Ruby'
 
How long does it take to flower? Typically 2 – 3 years with bright light, stable humidity, and tight roots.
 
Does it stay compact? Yes, it stays bushy unless supported — ideal for shelves and hanging pots.
 
Can I grow it in low light? It will survive, but growth will slow and flowering may not occur.
 
What makes it different from Hoya 'Joy'? ‘Puom Siam Ruby’ has stronger venation and more consistent red margining compared to ‘Joy’.
Add Hoya 'Puom Siam Ruby' to Your Collection
This rare Thai hybrid combines the lush texture of its parentage with a subtle ruby glow, ideal for growers who want foliage with character. Compact, rewarding, and visually rich — Hoya 'Puom Siam Ruby' is a gem for any indoor jungle. Order yours now and grow something truly special.