Alocasia Blood Bone: The Complete Collector's Guide to Wim Philtjens' Documented Hybrid

In a collector hobby where the word "rare" is used so frequently it has nearly lost meaning, Alocasia Blood Bone offers something genuinely unusual: documented hybrid heritage from a named, credible breeder, combined with visual characteristics distinctive enough to be immediately identifiable by anyone who knows the plant well. Created by Belgian hybridiser Wim Philtjens, Blood Bone represents deliberate, intentional plant breeding of the kind that serious collectors recognise and value, not a spontaneous mutation or an undocumented plant from uncertain origins, but the result of a skilled grower making a specific cross with specific goals in mind.

This guide covers everything collectors need to know about Blood Bone: its parentage and what that parentage means for the plant's characteristics, the crossing order that distinguishes it from its sibling hybrid Alocasia Golden Bone, the visual features that make it immediately distinctive, and the growing conditions that allow it to express its full character. Whether you are considering adding Blood Bone to your collection or have already acquired a specimen and want to grow it well, this guide provides the depth of information that serious collectors need.

Understanding the Parents: Alocasia cuprea and Alocasia micholitziana 'Green Velvet'

Before exploring Blood Bone itself, it is worth understanding the two parent species in some depth, because the characteristics of each parent are directly legible in the hybrid, and knowing what came from where gives collectors a much richer understanding of what they are growing.

Alocasia cuprea: The Bornean Mirror Plant

Alocasia cuprea is, by any botanical measure, one of the most extraordinary plants in the Alocasia genus. First introduced into European cultivation in 1854 as Caladium cupreum by botanist K.H.E. Koch, and first grown in England by Low & Co. of Clapton Nursery in 1859, it has the distinction of being, according to Aroidpedia, the only Bornean Alocasia species in continuous cultivation since its introduction around 1860. That is over 160 years of documented cultivation history, a remarkable record that speaks to the plant's enduring appeal.

Native to Sabah and Sarawak in Borneo, A. cuprea grows on rocky slopes in rainforest, around sandstone, limestone, and ultramafic areas at approximately 1,000–1,500 metres altitude. This specific ecology is revealing for growers. The fact that the species grows on slopes, not in waterlogged valley bottoms, indicates a preference for free-draining conditions. Aroidpedia notes that cuprea "doesn't have a large root system, despite sporting numerous large leaves," a characteristic that reflects its natural habitat: it roots among the rocky forest floor on slopes where it has little use for deep, penetrative roots, instead absorbing epikarst water and storing it in its huge, thick, leathery leaves. This ecological context explains directly why cuprea dislikes waterlogged substrate in cultivation, a preference its hybrid offspring Blood Bone inherits.

The leaves themselves are the defining characteristic. Herb to approximately 80cm tall, A. cuprea produces ovate, bullate (blistered between the main veins) leaves to about 60cm long by 40cm wide. The adaxial (upper) surface is glossy bronze-green, darker near the primary veins, this is the famous metallic, coppery sheen that the name cuprea (from the Latin for copper) references. The abaxial (underside) surface is deep purple. The metallic surface quality is not pigmentation but structural, a function of the microscopic cell arrangement that creates iridescence in the same way that a soap bubble or an oil film creates colour through light interference. Juvenile leaves show red on both surfaces; mature leaves retain red only on the undersides.

On the taxonomy: Aroidpedia confirms that no cultivars of Alocasia cuprea are formally recognised despite numerous commercial names being used. Only two natural forms are distinguished, solely by inflorescence chamber colour, one with a wine-red chamber, another mostly green. Variations in leaf colour observed among plants reflect natural variability and maturity differences, not distinct cultivars.

Alocasia micholitziana 'Green Velvet': The Philippine Velvet Species

The second parent of Blood Bone is Alocasia micholitziana, specifically the cultivar correctly known as 'Green Velvet'. As Aroidpedia confirms, though this plant is widely sold under the incorrect cultivar name 'Frydek', a trade designation that became commercially widespread but has no formal botanical validity, botanical precedence ascribes 'Green Velvet' as the correct cultivar name. The name 'Maxkowskii' is also no longer valid.

Correct botanical naming matters not as pedantry but as practical accuracy. When collectors discuss hybrids where this species appears as a parent, and micholitziana 'Green Velvet' appears as a parent in Blood Bone, Golden Bone, and through Velvet Dragon, using the correct name prevents confusion and allows accurate cross-referencing of characteristics. We use 'Green Velvet' throughout our content, and we would encourage other growers and sellers to do the same.

Alocasia micholitziana 'Green Velvet' is native to the Philippines, producing the distinctive velvety, dark green arrow-shaped leaves with prominent white venation that have made it one of the most universally appreciated Alocasia in cultivation. The velvet quality arises from a dense covering of fine trichomes (surface hairs) that give the leaf a matte, tactile quality completely unlike the glossy surface of most other Alocasia. This textural quality is part of what Green Velvet contributes to Blood Bone, though in the hybrid the velvet character is softened and modified by the cuprea influence.

The plant typically reaches 60–90cm in height in cultivation, with leaves up to approximately 35–40cm in length. It is notably more tolerant of lower humidity than many specialist collector Alocasia, which makes it a practical parent for hybrids intended for indoor cultivation.

The Cross: Cuprea as Berry Carrier, Green Velvet as Pollen

The specific crossing order that produces Blood Bone is Alocasia cuprea as berry carrier (female parent) crossed with Alocasia micholitziana 'Green Velvet' as pollen parent (male). In controlled hybridisation, which parent functions as berry carrier and which as pollen donor genuinely matters, reciprocal crosses (where the parents are reversed) can produce offspring with different characteristics, because maternal inheritance effects and the different contributions of each parent's genetics create a different hybrid character depending on the direction of the cross.

The reversed cross, Alocasia micholitziana 'Green Velvet' as berry carrier, cuprea as pollen, produces Alocasia Golden Bone, the sibling hybrid that is discussed in depth in our Golden Bone guide. The two hybrids share the same parent species but have meaningfully different visual characteristics, most notably, Blood Bone's hallmark deep red stems versus Golden Bone's distinctive golden central nerve. This difference is a direct product of the crossing direction.

It is worth noting, as Aroidpedia documents, that Alocasia 'Golden Bone' as a plant has a complex origin story of its own: it was introduced to the market in 2006 by Indonesian grower AstriYanto, who reportedly obtained a specimen from a friend who collected it from the jungle, making Golden Bone a presumed natural hybrid of uncertain documented origin. Blood Bone, in contrast, is a deliberate, documented creation by Wim Philtjens, which gives it a cleaner provenance and a named breeder who can be credited and referenced.

Visual Characteristics: What Blood Bone Looks Like

The most immediately distinctive feature of Blood Bone is its stems. The petioles, the stalks that support each leaf, are a deep, rich red that stops collectors when they first encounter the plant. This red stem characteristic is the one that gives Blood Bone its name, and it is sufficiently consistent and dramatic that experienced collectors can identify the plant at a glance, even before examining the foliage closely.

The leaves themselves reflect both parents. From the cuprea side: a degree of the metallic, reflective surface quality, a moderate thickness and substance, and the roughly ovate leaf form. From the micholitziana 'Green Velvet' side: the deep green base colour and the quality of the venation, though in Blood Bone the venation is somewhat less dramatically white than in the pure 'Green Velvet'. The result is a leaf that sits interestingly between its parents, more substantial and metallic than 'Green Velvet', less dramatically copper-toned than standard cuprea, with a surface quality that is its own rather than simply a blend of either parent's character.

The undersides of Blood Bone leaves retain the reddish tone inherited from cuprea, visible when leaves are seen from below or in angled light, creating a bicolour presentation that adds to the plant's visual interest from multiple viewing angles.

Growth habit is upright and moderately compact, Blood Bone does not sprawl or trail but produces leaves on an upright structure that makes it effective both as an individual specimen and as part of a larger collection display. Mature plants in good condition develop a confident, considered presence that distinguishes them from more common Alocasia.

Growing Alocasia Blood Bone: Complete Care Guide

Understanding both parents' ecological origins informs how to grow Blood Bone well. The cuprea parent's slope-dwelling, free-draining habitat requirements, combined with the micholitziana 'Green Velvet' parent's moderate humidity tolerance, create a hybrid that is more forgiving than some specialist collector Alocasia while still having specific requirements that must be met for the plant to thrive and express its distinctive character.

Light Requirements

Blood Bone performs best under bright indirect light, this is the single most important variable for both plant health and for the metallic surface quality inherited from cuprea to be at its most apparent. In lower light conditions, the reflective surface quality of the leaves diminishes noticeably; under good bright indirect light, the leaf surface catches and shifts with available light in a way that makes the plant significantly more impressive.

In a UK home, position within 1–1.5 metres of a south or west-facing window, or use an east-facing window that provides several hours of bright morning light. During UK autumn and winter, when daylight hours reduce significantly and light quality drops, supplementing with LED grow lights will prevent the light-related decline that Blood Bone can experience if allowed to sit in low winter light for extended periods. Avoid direct sun at any time of year, despite being less sensitive than some Alocasia, Blood Bone can develop leaf bleaching and burning under direct sun exposure.

Temperature

Maintain a growing temperature of 18–27°C during active growth periods. Blood Bone is reasonably tolerant of temperatures down to about 15°C, but growth slows significantly below 18°C and the plant becomes more vulnerable to root issues at lower temperatures, cold combined with wet substrate is a particularly damaging combination. UK homes typically maintain adequate temperatures during summer, but collectors should be aware that poorly heated rooms, conservatories, or spaces near single-glazed windows can create temperature drops in winter that stress the plant.

Avoid cold draughts, positioning near draughty doors, windows, or in the path of cold air conditioning vents creates temperature stress that manifests in leaf edge damage and stunted new growth. Consistency of temperature matters almost as much as the temperature itself; Blood Bone, like most Alocasia, dislikes fluctuation more than it dislikes consistently cool (but not cold) conditions.

Humidity

Blood Bone requires consistent ambient humidity of 60–80% for sustained healthy growth and attractive foliage. At the lower end of this range (around 60%), the plant will grow adequately; at the upper end (75–80%), it will produce its most impressive foliage and maintain the metallic surface quality at its most vivid. UK homes in winter, with central heating running, typically maintain 30–50% ambient humidity, significantly below what Blood Bone needs.

A quality humidifier positioned near the plant is the most reliable solution. Grouping Blood Bone with other moisture-transpiring tropical plants creates a localised humidity zone that can raise the ambient reading by 10–15%. Pebble trays filled with water provide a minor supplement but are insufficient as a primary humidity solution for a plant with Blood Bone's requirements.

The micholitziana 'Green Velvet' parentage does give Blood Bone somewhat better humidity tolerance than pure cuprea forms, 'Green Velvet' itself is a relatively resilient species, which means Blood Bone is more forgiving than many specialist collector Alocasia at the lower end of the humidity range. Nevertheless, sustained low humidity (below 50%) will produce visible deterioration in leaf quality: first, margin browning, then a generally less vibrant, less attractive appearance.

Substrate and Potting

Given the cuprea parent's ecology on Bornean rocky slopes, where drainage is excellent and the root environment is well-aerated, Blood Bone strongly prefers substrate that drains completely and dries between waterings rather than staying constantly moist. A well-draining chunky aroid mix is the correct choice: a combination of coarse bark, perlite, and coco coir in roughly equal proportions creates the aerated, free-draining environment that suits this hybrid's heritage.

For corm propagation, Fluval Stratum is our primary substrate recommendation. Its volcanic basalt origin, neutral-to-slightly-acidic pH, and porous structure create excellent conditions for corm establishment, the capillary moisture retention provides consistent moisture access without the waterlogging risk that finer substrates create. Our complete guide to growing Alocasia corms in Fluval Stratum covers the process in detail.

Choose a pot with drainage holes and avoid containers that are significantly larger than the root mass, oversized pots hold more moisture in their outer substrate than roots can absorb, creating waterlogged zones that invite root rot. Terra cotta pots, which breathe and allow moisture to evaporate through their walls, can be a useful choice for growers who tend toward overwatering; plastic pots retain moisture longer and suit more restrained waterers.

Watering

Allow the top 2–3cm of substrate to dry between waterings, then water thoroughly until moisture runs freely from the drainage holes. This approach mirrors the plant's natural highland slope conditions, where rainfall is absorbed and then drains away rather than accumulating. Empty any drainage water from saucers promptly, Blood Bone should never sit with its roots in standing water.

Reduce watering frequency significantly in winter, when light levels are lower and growth slows. A Blood Bone in winter conditions needs perhaps half the water it consumes during active summer growth. The most common cause of Blood Bone decline in UK collections is persistent overwatering during winter, the combination of low light, reduced growth, and continued frequent watering creates exactly the anaerobic, wet conditions that lead to root rot.

If you are uncertain whether the plant needs water, err toward waiting rather than watering. Blood Bone will tell you when it is thirsty: leaves will develop a slightly less turgid quality, and eventually the stems will soften marginally. These early signs of thirst are far preferable to the invisible early stages of root rot, which progresses without obvious symptoms until significant damage has already occurred.

Our guide to Alocasia root rot covers identification, prevention, and recovery in detail, essential reading for any collector maintaining rare and exotic Alocasia.

Feeding

During active growth, broadly from late spring through early autumn in UK conditions, feed with a balanced liquid fertiliser at half-strength every second or third watering. The half-strength application is important: Blood Bone does not benefit from aggressive fertilisation, and excess nutrients accumulate as salts in the substrate that can damage roots and suppress growth over time. Little and often, at reduced concentration, serves this plant better than infrequent heavy applications.

Stop feeding entirely from late October through February. During the low-light winter period, Blood Bone's growth slows significantly and its ability to process nutrients reduces accordingly. Continuing to feed during this period adds salts without providing the growth benefit that justifies them. Resume feeding only when you observe new growth emerging in spring, indicating the plant is entering active growth again. Our plant feed collection covers the products we recommend for collector-grade Alocasia.

Repotting

Repot when roots begin to emerge from drainage holes or when the plant produces multiple offset pups that are crowding the pot. Blood Bone generally prefers being slightly pot-bound to having excess substrate volume around its roots, a snug-fitting pot with good drainage serves it better than a large pot with considerable un-rooted substrate.

When repotting, take the opportunity to examine the root system carefully. Healthy Blood Bone roots should be white to pale tan, firm, and plentiful. Any dark, soft, or mushy roots should be removed cleanly, and the remaining healthy roots should be treated with a fungicide drench before repotting into fresh substrate.

Blood Bone Alongside Golden Bone: Understanding the Sibling Pair

For collectors interested in the full picture of what cuprea × micholitziana 'Green Velvet' hybridisation produces, owning both Blood Bone and Golden Bone side by side is genuinely illuminating. The two plants share the same genetic material but express it differently based on crossing direction. Blood Bone presents its red stem character with the cuprea metallic quality as the dominant visual influence; Golden Bone presents the golden central nerve with the Green Velvet leaf form as more legible.

Together they demonstrate a fundamental principle of plant hybridisation: the direction of a cross matters as much as the species involved. This is not merely an interesting botanical observation, it is the kind of knowledge that distinguishes collectors who understand their plants from those who simply accumulate them.

For collectors who have also explored the Golden Bone Variegated form, or who are interested in Velvet Dragon, Philtjens' second hybrid, which crosses micholitziana 'Green Velvet' with Alocasia tandurusa 'Jacklyn', Blood Bone sits as the first and arguably most botanically significant creation in a small family of documented hybrids from the same breeder. Understanding it fully enhances appreciation of all the others.

Blood Bone in the Broader Collection

Blood Bone is available from The Alocasia Company as corm, juvenile, and mature specimen. Each growth stage offers a different relationship with the plant: corm and juvenile forms allow collectors to develop the plant from its earliest stages, watching the characteristic red stem colour emerge and intensify as the plant matures; mature specimens offer immediate, fully developed presence and the established metallic-red aesthetic that makes Blood Bone so distinctive in any collection.

For collectors building a collection organised around documented hybrid Alocasia, Blood Bone is one of a handful of plants that truly warrants the "rare" designation, not because of temporary supply constraints or marketing language, but because it represents a specific, documented breeding achievement from a named hybridiser that cannot be replicated simply by obtaining the same parent species and crossing them randomly. Wim Philtjens' skill and intention are part of what you are acquiring when you add Blood Bone to your collection.

Questions about Alocasia Blood Bone, its parentage and relationship to Golden Bone and Velvet Dragon, or growing this hybrid in a UK collection? Contact our team for expert guidance from specialists who grow Blood Bone and the complete Wim Philtjens hybrid range at our UK nursery.