Hoya carnosa 'Grey Ghost' is one of the most visually striking cultivars of the classic Hoya carnosa – and one of the most sought-after among serious collectors. What sets it apart is its extraordinary foliage: thick, waxy leaves that appear almost entirely silver-grey, as if a ghost has breathed its pallor across every surface. While the standard Hoya carnosa shows only scattered silver flecking on green leaves, the 'Grey Ghost' takes this trait to the extreme – the silver speckles are so dense and so comprehensive that they dominate the leaf surface, leaving only minimal green visible beneath. The effect is ethereal, muted, and unmistakably distinctive.

The leaves are oval to slightly heart-shaped, thick and semi-succulent, measuring approximately 10 cm long by 4 cm wide at maturity. Their surface has a matte, subtly metallic sheen that shifts with the light – sometimes appearing cool silver, sometimes warm grey, sometimes hinting at the faintest undertone of lavender. Some specimens develop scattered dark green patches or fine veining visible through the silver overlay, adding depth and complexity to the foliage. The waxy coating that gives all Hoyas their common name is clearly evident here, protecting the leaf surface and contributing to the plant's drought tolerance. An interesting quirk noted by growers: too much bright light can cause the leaves to revert toward greener tones, while moderate indirect light preserves and intensifies the silver-grey colouration that makes this cultivar so desirable.

As a cultivar of Hoya carnosa – one of the oldest and most established Hoya species in cultivation – the 'Grey Ghost' inherits a robust, proven growth framework. It is a vining epiphyte with trailing or climbing stems that can reach up to 3 metres in length over time. However, this particular cultivar is notably slower-growing than the standard Hoya carnosa. Where the parent species is famously vigorous and easy, the 'Grey Ghost' takes its time, producing just a few new leaves per year in some cases. This is widely reported by experienced growers and is considered a normal characteristic of the cultivar, not a sign of poor health. Patience is genuinely part of the experience with this plant.

When mature and content, Hoya carnosa 'Grey Ghost' produces the classic Hoya carnosa flowers: clusters (umbels) of up to 25 individual star-shaped blooms, each approximately 20 mm in diameter. The flowers are baby pink with plum-coloured centres (corona), waxy in texture, and strongly sweet-scented – particularly noticeable in the evening. Each cluster produces nectar and lasts up to 7 days. Flowers emerge from persistent peduncles (spurs) that should never be removed, as new blooms return from the same structures year after year. Blooming requires patience, consistent bright indirect light, and a well-established root system – it can take several years before a young plant flowers for the first time.

Care Requirements:

• Light: Bright, indirect light is essential for healthy growth and the best chance of flowering. Avoid harsh direct midday sun, which can scorch the silvery leaves. East or west-facing windows are ideal. An interesting detail: moderate light levels help preserve the signature silver-grey colouration, while excessive light can push the leaves toward greener tones. Supplement with a grow light during dark winter months to maintain even growth.
• Water: Allow the soil to dry out thoroughly between waterings, then water deeply and let all excess drain away. The thick, succulent leaves store water efficiently and the plant is far more tolerant of underwatering than overwatering. Reduce watering significantly in autumn and winter when growth slows. Always use pots with drainage holes. Room temperature, low-lime water is preferred.
• Soil: A well-draining, airy, chunky substrate is essential. Mix orchid bark, perlite, and a small amount of coco coir or pine bark to create a fast-draining medium that mimics epiphytic conditions. A cactus/succulent mix with added perlite also works well. Avoid heavy, moisture-retaining potting soils that can cause root rot.
• Temperature: 15-35°C (59-95°F) for an intermediate Hoya. Comfortable at normal room temperatures (18-26°C is the sweet spot). Protect from cold drafts, sudden temperature fluctuations, and proximity to radiators or air conditioning units. Do not expose to temperatures below 14°C (57°F) for prolonged periods.
• Humidity: Adapts well to average household humidity (40-50%), but benefits from moderate to high humidity levels (50-60%). In very dry environments – particularly during winter heating season – occasional misting or a nearby humidifier improves leaf health and appearance. Good air circulation is important to prevent fungal issues.
• Feeding: Half-strength balanced liquid fertilizer every 3-4 weeks during the active growing season (spring to late summer). A phosphorus-rich formula can support flower formation on mature plants. Reduce or stop fertilizing entirely in autumn and winter. Avoid over-fertilizing – this cultivar's naturally slow growth means it processes nutrients gradually.

Botanical Info: Family: Apocynaceae | Genus: Hoya | Species: Hoya carnosa (L.f.) R.Br. | Cultivar: 'Grey Ghost' | Common Names: Grey Ghost Wax Plant, Silver Ghost Hoya | Type: Epiphytic Vine (trailing/climbing) | Origin: Cultivar; parent species native to East Asia (southern China, Taiwan, Japan, Laos) | Zone: 9b-12 (indoor cultivation in temperate climates) | Flowering: Star-shaped, baby pink with plum centres, fragrant, up to 25 per umbel, 20 mm diameter