Hoya finlaysonii 'Sukirin' is a regional form of one of the most stunning foliage Hoyas in cultivation – a plant grown not primarily for its flowers, but for leaves so architecturally beautiful and texturally unique that Vermont Hoyas declares it "can be grown only for the spectacular leaves." The 'Sukirin' form, collected from the humid montane forests of Sukhirin district in southern Thailand, distinguishes itself within the species with particularly pronounced silver splash markings across its already extraordinary veined foliage. This is a Hoya for collectors who understand that great leaves can be just as rewarding as great flowers.

The species Hoya finlaysonii was described by Robert Wight and honours George Finlayson (1790–1823), a Scottish naturalist, traveller, and one of the original collectors of this species on Penang Island in Malaysia. The species is native to Thailand, Malaysia, and Indonesia (including Borneo), where it grows as a climbing epiphyte along rivers and streams in lowland tropical forests and at clearing edges. The 'Sukirin' form takes its name from the Sukhirin district in Narathiwat province, Thailand's southernmost region – a remote area on the Malay Peninsula bordering Malaysia, embraced by mountains and curtains of fog year-round. The name "Sukhirin" itself means "beautiful lush greenery" in Thai, a fitting origin for a plant of such visual richness.

The leaves are the centrepiece, and what leaves they are. The 'Sukirin' form produces wide, oval to elliptical leaves – broader than the narrow, classic type form – with a matte light green base surface, thick, leathery, and remarkably hard when mature. World of Succulents documents the species' leaves at up to 15 cm long and 5 cm wide, with a texture likened to stiff cardboard. Against this pale green canvas, a bold network of prominent dark green to near-black veins creates an intricate, high-contrast pattern that looks almost hand-drawn or etched into the surface. The venation is the defining aesthetic of every Hoya finlaysonii, but the 'Sukirin' form adds another layer: shimmering silver speckles and splash markings scattered across the leaf surface, giving each leaf a luminous, sparkling quality that the plain-leaved classic form lacks. The leaf margins are slightly rough or semi-serrated – what Steve's Leaves describes as "crisp edges" with a "jagged" quality. The deep green leaf margins frame the lighter centre beautifully. New leaves emerge softer and lighter before hardening into their mature, rigid texture. The overall visual effect is sculptural: part botanical specimen, part living artwork.

The growth habit is slow-vining and compact, with relatively short internodes that produce a well-furnished, dense appearance. Vines can reach 1.5-2 metres with appropriate support, and the plant can be trained to climb on a trellis, moss pole, or hoop, or left to trail from a shelf or hanging basket. Stems are green when young but gradually turn dull yellow as they mature, reaching approximately 0.8 cm in diameter.

The flowers, while secondary to the foliage in this species, are genuinely lovely. Hoya finlaysonii produces small umbels of up to 35-40 reflexed, star-shaped flowers. The corolla is creamy-white to bone-white at the base, transitioning to brown-maroon or purple at the tips of the petals. The corona is porcelain white. The fragrance is subtle and distinctive – variously described as mild citrus by Tropics@Home and light cinnamon by Gabriella Plants. Flowers are notably short-lived compared to many Hoyas: World of Succulents documents a lifespan of approximately 3 days per cluster. Vermont Hoyas confirms this brevity, noting that first flowering occurred approximately 3 years from cutting. Tropics@Home states the species is easy to flower and may bloom throughout the year under ideal conditions. As with all Hoyas, never remove old peduncles – the same flower stalks will produce new blooms in subsequent seasons.

Care Requirements:

• Light: Bright, indirect light is essential – this species needs good light to develop its signature veining contrast and maintain compact growth. Tolerates some filtered morning sun, but protect from harsh midday rays that can scorch the leaves. In lower light, growth becomes weak, leggy, and the beautiful leaf patterning can be less defined. Supplementary grow lights (10-12 hours daily) are strongly recommended during northern European winters. The bright indirect light also promotes more frequent flowering on established plants.
• Water: Vermont Hoyas grows this species "very wet" – an important distinction from the standard Hoya advice of "let it dry completely." While the substrate must drain freely, Hoya finlaysonii appreciates consistent moisture during active growth. Allow the top 2-3 cm to dry between waterings, then water thoroughly. Do not let the root zone dry out completely for extended periods. Despite the thick, rigid leaves, this is not a drought-tolerant species in the same way as succulent-leaved Hoyas. Reduce watering in winter but maintain light moisture. Overwatering remains dangerous – if the plant sits in soggy, airless substrate, root rot can develop rapidly. The key is consistent, moderate moisture with excellent drainage.
• Soil: Well-draining, airy, chunky substrate. A mix of orchid bark, perlite, and coco coir or coconut chips provides the right balance. The epiphytic root system needs excellent aeration. Some growers add horticultural charcoal for additional drainage and disease prevention. As an epiphyte with a shallow root system, this plant does not need a deep pot and prefers to be slightly rootbound.
• Temperature: 18-28°C is the ideal range. This is a warm-growing species from near-equatorial tropical forests. Vermont Hoyas emphasises "warm" conditions as a key requirement. Avoid temperatures below 10°C. Protect from cold drafts, draughty windows, and radiators. Consistent warmth year-round produces the best growth and the most frequent flowering.
• Humidity: High humidity (60-80%) is strongly recommended. Vermont Hoyas specifically grows this species under "warm and humid" conditions. The 'Sukirin' form originates from a mountainous Thai district described as "embraced by mountains and curtains of fog all year" – a naturally high-humidity environment. Average household humidity (40-50%) is tolerated but may slow growth and reduce the silver splash expression. A humidifier, greenhouse cabinet, or terrarium setup makes a significant difference. Good air circulation must accompany high humidity to prevent fungal issues. Misting with rainwater can provide foliar nutrition, as recommended by Plantophiles.
• Feeding: Half-strength balanced liquid fertilizer every 2-4 weeks during the growing season (spring-summer). A high-potassium formula can encourage flowering on established plants. Avoid overfeeding – the slow growth rate means the plant processes nutrients gradually. Stop fertilizing in autumn and winter.

Botanical Info: Family: Apocynaceae | Genus: Hoya | Species: Hoya finlaysonii Wight | Form: 'Sukirin' (regional collection from Sukhirin, Narathiwat, Thailand) | Common Names: Finlayson's Wax Plant | Type: Epiphytic Climbing Vine | Origin: Sukhirin district, Narathiwat province, southern Thailand (species range: Thailand, Malaysia, Indonesia) | Zone: USDA 10-11 (indoor cultivation in temperate climates) | Flowering: Reflexed, white/cream base with maroon-purple tips, white corona, up to 35-40 per umbel, mild citrus-cinnamon fragrance, short-lived (approx. 3 days), spring-summer | Growth Rate: Slow to moderate