Phlebodium aureum 'Blue Star' (Blue Star Fern, Blue Star Hare's-Foot Fern, Blue Rabbit's-Foot Fern)
Phlebodium aureum 'Blue Star'
Table of Contents
Introduction & Discovery
'Blue Star' is the trade name for a compact, strongly glaucous selection of the pantropical hare's-foot fern, Phlebodium aureum. The clone is often said to have been selected and brought into widespread commercial propagation in the Netherlands in the late twentieth century, though the precise selection history is not well documented in the horticultural literature and several almost-identical blue-foliaged selections have circulated under similar names. What is clear is that by the 1990s 'Blue Star' had become one of the standard bread-and-butter epiphytic ferns of the European and North American houseplant trade, admired for its striking chalky blue-green foliage, its tolerance of average indoor conditions, and its distinctive furry creeping rhizome that gives the genus its common name. The plant is a clonal selection rather than a hybrid, and every commercial 'Blue Star' in circulation is understood to be a single genetic individual reproduced by rhizome division and tissue culture. Its underlying biology is that of ordinary P. aureum: a tetraploid epiphyte, probably with the somatic chromosome count of 2n = 148 reported for the species, bearing sori without indusia in regular rows between the midrib and margin of each frond lobe. The cultivar's popularity reflects a broader shift in the indoor plant market toward foliage that reads as ornamental architecture rather than mere greenery. Its slightly waxy blue surface and bold lobed outline look well against terracotta, pale plaster, and raw wood, and the rhizome can be trained over driftwood, cork, or the lip of a pot so that the furry scales are part of the display. Rooted firmly in the Polypodiaceae and in the long horticultural history of hare's-foot ferns grown from the Victorian era onward, 'Blue Star' occupies a sweet spot in modern rooms: enough character to be noticed, enough toughness to survive, and enough familiarity that reliable care information is easy to find.
Discovery & Naming
The precise origin of 'Blue Star' is not well documented in the public horticultural literature. The clone is most commonly said to have been selected in Dutch commercial nurseries during the late 1980s or early 1990s, during a period of rapid expansion in the European tissue-cultured foliage-plant trade, and it entered very wide distribution in the following decade. A number of sources attribute the selection to specific growers, but no primary citation is known to the author, and several near-identical blue selections circulate under overlapping names in different markets. What is certain is that by the mid-1990s 'Blue Star' had become an established staple of Dutch nursery catalogues, from where it spread rapidly into North American and East Asian commercial production. The underlying species has a much older horticultural history: Phlebodium aureum was introduced to European cultivation in the late seventeenth and early eighteenth centuries from the West Indies, formally described by Linnaeus in 1753 as Polypodium aureum, and transferred to the segregate genus Phlebodium by John Smith in 1841 on the basis of its distinctive areolate venation. Victorian conservatories grew several named selections of the species including 'Cristatum' and 'Mandaianum' long before 'Blue Star' appeared. The cultivar thus sits at the end of a long historical sequence of human selection within P. aureum, representing the late-twentieth-century commercial preference for compact plants with strong visual character and reliable behaviour under mass production.
Native Range & Distribution Map
Distribution map showing the native range of Phlebodium aureum 'Blue Star'.
Biology & Frond Morphology
Phlebodium aureum 'Blue Star' belongs to the genus Phlebodium in the family Polypodiaceae, producing simple-pinnatifid evergreen fronds, deeply lobed rather than pinnate, with long narrow strap-like lobes separated by rounded sinuses; foliage is conspicuously glaucous blue-green, giving the cultivar its name. plants are reliably epiphytic in habit with a thick creeping rhizome densely covered in golden-brown scales. fronds that unfurl from coiled fiddleheads (croziers). Like all ferns, it reproduces via spores borne on the underside of fertile fronds rather than flowers and seeds, and its life cycle alternates between a dominant sporophyte (the visible plant) and a small, short-lived gametophyte stage.
Reproduction & Propagation
Propagation of Phlebodium aureum 'Blue Star' can be achieved through several methods:
- Spores: Collect ripe spores from the underside of fertile fronds, sow on sterilised peat or peat/perlite mix. Do not cover. Keep humid and in bright indirect light. Prothalli (gametophytes) typically develop in 4–12 weeks, and young sporophytes appear after a further 2–6 months.
- Division: Mature clumps with multiple crowns or creeping rhizomes can be divided in spring as new fronds emerge.
- Rhizome cuttings / offsets: Epiphytic genera (Davallia, Polypodium, Phlebodium) can be propagated from 5–10 cm rhizome segments with at least one frond and visible roots.
Cultivation & Substrate
Successful cultivation of Phlebodium aureum 'Blue Star' depends on matching three conditions to its natural habitat: consistent moisture without waterlogging, a humus-rich yet well-drained substrate, and the correct light level for its frond type — whether dappled woodland shade, bright filtered light, or, for a handful of rock ferns, direct sun.
Substrate: An airy epiphytic blend rather than a houseplant compost. A good general recipe combines medium orchid bark, coarse perlite or pumice, and chopped sphagnum or good-quality coir in roughly equal proportions, with a small handful of horticultural charcoal added to each pot to buffer against stagnation. Avoid fine peat-based houseplant composts. Slightly acidic to neutral, approximately pH 5.5–6.8. The waxy foliage is sensitive to hard alkaline water, so substrate pH tends to drift upward over time in limescale areas and should be monitored by rinsing through with distilled or rainwater occasionally. Free and fast. The substrate should drain within seconds of watering and the pot should feel significantly lighter within a few days. Raised shallow azalea pans or half-pots suit the creeping rhizome better than deep pots with a stagnant lower zone. Low to moderate. A quarter-strength balanced liquid feed every two to three weeks through spring and summer is ample. Slow-release pellets at low rates can substitute but should be used cautiously because build-up of salts on the wax bloom is unsightly and the rhizome is salt-sensitive. Moderate, in the form of bark and sphagnum rather than peat or loam. The rhizome requires a surface on which it can creep and into which it can send occasional fine roots; a pure mineral mix of bark and perlite is acceptable but benefits from a small organic fraction for moisture buffering.
Water: Rainwater or soft tap
Light: Bright indirect light is ideal; an east window, a shaded south window behind a sheer curtain, or a spot one to two metres back from a bright west window all work well. The glaucous bloom on the fronds is partly a response to fairly bright diffuse light, and plants kept in deep shade tend to produce greener, longer, more etiolated fronds that flop. Direct midday sun scorches the surface wax and leaves permanent pale patches, so no more than a little gentle early-morning sun should fall on the leaves. Under artificial lighting, a full-spectrum LED on a sixteen-hour cycle at moderate intensity keeps colour and form tight.
Humidity: See species profile
Common Mistakes to Avoid
The commonest errors with 'Blue Star' are all variants on treating it as a forest-floor fern when it is in fact an epiphyte. Planting in dense peat-based compost is the single most frequent mistake; the fine mix compacts, waterlogs, and suffocates the rhizome within months. Burying the rhizome below the substrate surface is almost as bad: the scales are not designed for permanent contact with wet medium and rot quickly. Watering to a calendar rather than by substrate weight leads to overwatering in winter and underwatering in hot bright summer conditions. Excessive humidity in sealed terrariums, without air movement, promotes fungal frond spots and rhizome rot. Heavy fertilising, especially with high-nitrogen feeds, greens the foliage, destroys the blue bloom, and causes fronds to flop. Placement in deep shade, often well-intended on the grounds that 'ferns like shade', produces spindly dark-green growth without the cultivar's characteristic colour. Hard tap water, particularly in limescale-prone areas, deposits visible mineral rings on the waxy fronds and gradually acidifies the substrate unfavourably. Finally, repotting too often, into too large a pot, or disturbing the rhizome unnecessarily all set the plant back; Phlebodium in general and 'Blue Star' in particular prefer to sit quietly and extend their rhizome over the surface rather than be frequently uprooted.
Seasonal Considerations
'Blue Star' grows continuously in warm bright conditions indoors and does not strictly require a seasonal regime, but adjusting care to the year's rhythm produces healthier plants. From late winter into spring, as day length increases, rhizome activity visibly resumes with pale new frond tips emerging from the apical scales. This is the moment to repot if necessary, to divide if propagation is wanted, and to begin regular fertilising. Through spring and early summer the plant is in full growth, producing the bulk of its annual frond complement, and benefits from slightly higher humidity, more frequent watering, and regular feeding at quarter strength. High summer can be a stress period if temperatures exceed 28 °C with dry air; moving the plant to a cooler shaded spot and increasing misting or ambient humidity helps. Early autumn sees a gradual slowing of growth; feeding should be reduced and eventually stopped by late October in northern temperate homes. Winter is a maintenance period: watering drops by perhaps half, fertilising stops entirely, and the grower's main task is to protect the plant from cold draughts, dry heated air, and overzealous attention. Resist the temptation to overwater winter-resting plants; the rhizome is well-adapted to dry rest and responds badly to saturated substrate at low temperature.
Diseases & Pests
Common issues affecting Phlebodium aureum 'Blue Star' in cultivation:
- Root/rhizome rot: Caused by waterlogged substrate, compacted soil, or overwatering in cool weather. Ensure the growing medium is well-aerated and never let pots sit in standing water for prolonged periods.
- Fungal leaf spot & Botrytis: Brown or grey blotches appear in stagnant, overly humid conditions. Improve air circulation, remove affected fronds, and avoid wetting foliage late in the day.
- Scale insects & mealybugs: The most common fern pests, hiding on stipes and frond undersides. Wipe off with a cotton swab dipped in diluted isopropyl alcohol, or treat with horticultural soap. Many chemical pesticides scorch fern fronds — always test on one frond first.
- Spider mites: Fine webbing and stippled fronds, common in dry indoor air. Raise humidity and rinse fronds regularly with tepid water.
- Frond browning (tip burn): Caused by dry air, direct hot sun, fluoridated or chlorinated tap water (especially in Nephrolepis, Calathea-loving filmy ferns), or soluble-salt build-up from fertiliser. Flush the pot with rainwater and reduce feeding.
Indoor Growing & Terrariums
Phlebodium aureum 'Blue Star' can be grown indoors as a houseplant or terrarium subject when its humidity and light requirements are met.
Indoor Setup
- Light: Bright indirect light — an east- or north-facing window, or 30–60 cm under an LED grow light (10–12 hours/day). Most ferns scorch in direct midday sun.
- Humidity: 50–80%. Group plants, stand pots on a pebble-and-water tray, or run a humidifier; misting alone rarely raises ambient humidity enough.
- Temperature: 16–24°C (60–75°F) for most indoor species; avoid cold drafts and hot radiators.
- Substrate: Peat-free potting mix with added perlite and orchid bark for drainage; epiphytic genera (Platycerium, Davallia) grow best mounted on bark or in a bark-heavy orchid mix.
- Water: Keep consistently moist but never waterlogged. Let the top 1–2 cm of substrate dry slightly between waterings in winter.
- Air circulation: A gentle fan discourages fungal leaf spot without drying out the fronds.
Landscape & Garden Use
Phlebodium aureum 'Blue Star' can be used in the garden wherever its hardiness and habitat preferences are matched. Ferns are classic choices for shaded borders, woodland gardens, stumperies, rockeries, stream-side plantings, and ground-cover under trees.
Landscape Tips
- Companions: Hostas, Astilbe, Heuchera, Tiarella, Epimedium, hellebores, snowdrops and other shade-tolerant perennials are classic partners.
- Soil preparation: Incorporate leaf mould or composted bark to improve moisture retention and mimic a forest floor.
- Mulching: A 3–5 cm mulch of chipped bark or leaf litter protects the rhizomes, conserves moisture, and slowly releases nutrients.
- Watering: Establish new plantings with regular deep watering during the first growing season; most hardy ferns need only occasional supplemental irrigation once established.
Conservation & Collector Notes
'Blue Star', like all cultivated cultivars, has no independent conservation status because it is not a wild entity. Its parent species Phlebodium aureum has not been evaluated globally under the IUCN Red List criteria, but across most of its range it is abundant to very abundant and in no sense threatened. In Florida, at the northern edge of its distribution, populations are locally vulnerable to habitat loss, tropical storms, freezing events, and historical collecting pressure from the foliage trade, and the species is present on several regional conservation lists as a plant of local interest rather than formal protection. The cultivar 'Blue Star' is in no way at risk: it is propagated in commercial nurseries across Europe, North America, and East Asia in very large numbers, both by division and by tissue culture, and is among the most widely distributed ornamental ferns in world horticulture. Cultivation of 'Blue Star' has no measurable conservation impact on wild populations of P. aureum because the commercial trade is wholly based on nursery stock rather than on wild collection.
Collector Notes
'Blue Star' is not a rarity and should not be sought through specialist channels when ordinary garden centres stock reliable young plants at modest prices. It is, however, worth choosing a specimen carefully. Good plants have a firm creeping rhizome with visibly plump golden scales, multiple actively expanding frond tips, and a clean blue-green bloom over all but the oldest fronds. Avoid plants with blackened or shrivelled rhizome tips, with fronds that show yellowing from the stipe upward, or with obvious mealybug or scale among the rhizome scales. Root systems through the base of a nursery pot indicate a plant ready for repotting rather than a fault. Small 9 cm plants establish rapidly and are usually a better economic choice than larger stressed specimens from long-term production. Serious collectors of Phlebodium will wish to grow 'Blue Star' alongside related cultivars such as 'Mandaianum' and 'Blue Capri', and beside the parent species and the diploid P. pseudoaureum for comparison; assembled together in a small epiphyte display the group illustrates the genus's notable range of leaf form within a largely conservative underlying architecture. The cultivar is not protected by plant breeders' rights in any of the major horticultural markets so far as is publicly documented, so propagation for personal use and local exchange is unrestricted.
Ethnobotany & Cultural Significance
The ethnobotany of 'Blue Star' is entirely that of its parent species, Phlebodium aureum, a plant with a long tradition of folk medical use across its Neotropical range. In Central America and the Caribbean, rhizome extracts known as calaguala or anapsol have been used for generations in popular remedies for skin complaints, inflammatory conditions, and general tonics. From the mid-twentieth century onward, extracts of P. aureum rhizome have been studied by pharmacological researchers and commercialised under trade names such as Anapsos, primarily for dermatological indications including psoriasis and vitiligo. Contemporary reviews suggest the rhizome contains calagualine-type compounds, phenolic acids, and polypodine-type ecdysteroids, but clinical evidence remains limited and the author cannot endorse any therapeutic use without the advice of a qualified practitioner. Readers should understand that none of this tradition or research applies to 'Blue Star' plants in a horticultural sense. Ornamental cultivars are grown for appearance, not for medicinal extraction, and their rhizomes should not be harvested or consumed. The ethnobotany is relevant here only as part of the cultural background of the species and as a reminder of the depth of human interaction with hare's-foot ferns throughout the Americas.
Frequently Asked Questions
Why is my 'Blue Star' losing its blue colour?
The glaucous bloom on 'Blue Star' is a surface wax that can be removed or thinned by several factors. Most commonly the cause is repeated overhead watering with hard tap water, which lays down lime deposits and gradually strips the wax; switch to rainwater or filtered water and water at the base of the plant rather than over the fronds. Heavy nitrogen fertilising also thins the bloom and greens the foliage; reduce feeding to a quarter-strength balanced liquid every two to three weeks. Very low light pushes the plant to produce longer, thinner, greener fronds; move to a brighter spot with strong indirect light. Finally, the bloom is physically delicate and is rubbed off by frequent handling, dusting, or brushing against other plants; place the fern where it will not be disturbed, and accept that the oldest fronds will naturally fade in colour as they age.
Should I mist my 'Blue Star'?
Misting has modest benefits and some costs. The plant appreciates moderate humidity and brief periods above 50 percent relative humidity, so a morning mist in a dry centrally-heated room can help during winter. However, prolonged wet foliage encourages fungal spotting, deposits limescale on the wax bloom if your water is hard, and offers little sustained humidity benefit because the mist evaporates within minutes. A better approach in most homes is to group the plant with other foliage, stand it on a pebble tray of shallow water kept just below pot-base level, or occasionally take it to a bright bathroom during a shower. Reserve actual misting for rare dry-air emergencies, and if you do mist, use rain or distilled water and mist early in the day so leaves dry by evening.
The rhizome is crawling out of the pot; should I repot?
Not necessarily. Creeping over the pot rim is normal Phlebodium behaviour and reflects the plant's epiphytic origins, where rhizomes wander across bark rather than down into soil. As long as the plant is producing healthy new fronds, the rhizome is firm and plump, and the substrate is still reasonably open when you insert a finger, there is no need to disturb anything. Repot only every two to three years in spring, when roots fill the pot, the rhizome has completely encircled the surface, or the old substrate has become fine and waterlogged. When you do repot, choose a pot only one size larger, place the rhizome horizontally on top of fresh epiphyte mix rather than burying it, and pin it in place with a short wire or plastic tie until roots re-anchor it.
Can I grow 'Blue Star' mounted on bark instead of in a pot?
Yes, and it often thrives this way. Choose a slab of cork, tree-fern fibre, or a weathered piece of hardwood, attach a pad of moist sphagnum to the face, and tie the rhizome onto the pad with soft cotton string or nylon fishing line, leaving the scales exposed and the growing tip pointing outward. Mist the mount until roots attach, typically within a few weeks, and thereafter water by dunking the slab in a bucket of rainwater or giving it a good shower every few days depending on humidity. Mounted plants dry faster than potted ones and need more frequent attention, but they display the furry rhizome to best effect. Mounting also encourages the rhizome to branch more freely than it sometimes does in a pot.
My 'Blue Star' is flopping and looks limp; what should I do?
Flopping fronds have three usual causes: underwatering (rhizome dehydrated, substrate bone-dry and pulling away from the pot wall), overwatering (rhizome rotting, fronds limp but substrate saturated), or excessive nitrogen and low light (fronds elongated, soft, and weak). Check the substrate first: if it is lightweight and dry, give a thorough soak and assess the plant over the following day; if it is heavy and wet with blackened rhizome tips, cut out the rot, repot in fresh dry airy mix, and withhold water for a week. If the substrate is merely moderately damp, assess light and feed: move the plant to a brighter spot out of direct sun, stop fertilising, and allow the plant to dry between waterings over several weeks. Recovery from moderate flop is usually complete within a growing season, whereas established rhizome rot often costs the plant.
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Quick Reference Summary: Phlebodium aureum 'Blue Star'
Golden Rule: Match moisture, light and humidity to each fern’s natural habitat — woodland ferns need shade and humus, rock ferns need drainage, filmy ferns need constant humidity.
Phlebodium aureum 'Blue Star' is a compact, strongly glaucous cultivar of the Neotropical hare's-foot fern, selected in Dutch commercial nurseries in the late twentieth century and now one of the most widely grown ornamental ferns worldwide. Its distinctive chalky blue-green pinnatifid fronds, carried on a thick creeping rhizome densely covered in golden-brown scales, make it an architectural foliage subject for bright modern interiors. As with all cultivars, it has no wild range of its own and is maintained entirely by vegetative propagation; spore-raised plants do not come true. Care reflects its epiphytic origins: an airy bark-and-perlite substrate, the rhizome placed on rather than in the mix, careful watering by feel with soft water, moderate humidity, and light fertilising during the growing season. Treated as an epiphyte rather than a forest-floor fern, and protected from overwatering, hard water, and deep shade, 'Blue Star' is an undemanding, long-lived, and visually distinctive houseplant suited to USDA 10b–11 outdoors and to bright indirect indoor positions almost anywhere.