Introduction & Discovery

Polypodium vulgare 'Elegantissimum' is among the most prized and visually refined cultivars of the common polypody, bearing the superlative Latin epithet elegantissimum, meaning most elegant, an accolade that generations of fern enthusiasts have confirmed as thoroughly deserved. This cultivar produces bipinnate to tripinnate fronds with narrow, finely serrated pinnae that create a feathery, almost fern-within-a-fern appearance of exceptional delicacy and grace. The distinction of 'Elegantissimum' lies not merely in the degree of frond division but in the particular quality of that division. Where 'Cornubiense' creates a dense, lacy mass of tiny ultimate segments, 'Elegantissimum' produces longer, narrower divisions with finely serrate margins that give each frond a light, open, plumose quality. The effect is more feathery than lacy, more flowing than dense, and the overall impression is one of refined elegance rather than intricate complexity. The cultivar was discovered during the Victorian era, when the systematic search for unusual fern variants in the British countryside yielded an extraordinary harvest of natural forms. Among the many P. vulgare cultivars identified during this period, 'Elegantissimum' quickly gained recognition as one of the finest, its graceful form winning admirers among both serious pteridologists and casual garden enthusiasts. The superlative name was awarded in the Victorian tradition of expressive nomenclature, and it has stood the test of time as the cultivar has maintained its popularity through more than a century of continuous cultivation. For the modern fern gardener, 'Elegantissimum' offers a combination of ornamental sophistication and practical toughness that is difficult to surpass. The cultivar inherits the full hardiness, drought tolerance, and evergreen persistence of P. vulgare while delivering a level of visual refinement that elevates it well above the common species. It is a fern that justifies its superlative name, rewarding every gardener who provides it with a well-drained, shaded corner.

Discovery & Naming

Polypodium vulgare 'Elegantissimum' was discovered during the Victorian era of fern collecting and represents one of the most admired finds of the pteridomania period. The combination of finely divided fronds with serrate margins was recognized as an unusually elegant mutation, and the superlative name was awarded by the Victorian fern community to reflect their assessment of the cultivar's exceptional beauty. The cultivar has been in continuous cultivation since its discovery, maintained by successive generations of fern enthusiasts. It features in the classical pteridological literature, including the works of Thomas Moore, Charles Druery, and other Victorian authorities on British fern varieties. Martin Rickard's modern treatment in 'The Plantfinder's Guide to Garden Ferns' (2000) continues to recommend it as one of the finest P. vulgare selections. The history of 'Elegantissimum' illustrates the notable social phenomenon of Victorian pteridology, when thousands of ordinary British citizens participated in the systematic documentation of fern variation, creating a body of horticultural knowledge and a living collection of cultivars that continues to enrich gardens today.

Frond Morphology

The fronds of Polypodium vulgare 'Elegantissimum' are bipinnate to tripinnate, achieving two to three orders of division from the once-pinnate baseline of the wild species. The fronds measure 15 to 35 centimeters (6–14 inches) in total length, with a stipe of 5 to 12 centimeters (2–5 inches). The blade is narrowly triangular to lanceolate-ovate, 10 to 25 centimeters (4–10 inches) long and 6 to 14 centimeters (2.4–5.5 inches) wide. The primary pinnae are arranged alternately along the rachis, the lower ones largest and most elaborately divided. Each primary pinna is divided into narrow, linear to narrowly oblong secondary pinnae (pinnules) that are themselves often shallowly lobed or incised, creating the third order of division in the most fully expressed specimens. The pinnules are 5 to 15 millimeters (0.2–0.6 inches) long and 1.5 to 3 millimeters (0.06–0.12 inches) wide, with distinctly serrate margins that bear small, sharp teeth along both sides. The serrate pinna margins are a distinctive feature of 'Elegantissimum' that distinguishes it from the entire-margined wild type and from the 'Cornubiense' cultivar, whose ultimate segments have smooth margins. The teeth are small but clearly visible under a hand lens and contribute to the frond's overall textural richness. The serration pattern continues along the margins of all secondary and tertiary divisions. The overall frond texture is herbaceous, bright to medium green, lighter and more airy than the standard species. The narrow pinnules and their serrate margins create a feathery or plumose quality, particularly when the frond is viewed in profile. The frond is flexible and responds to air currents with a gentle, fluid movement. Sori may be present on the larger pinnules, small, round, and exindusiate, though fertility is reduced compared to the wild species. The rhizome is creeping, 3 to 6 millimeters in diameter, covered with golden-brown, lanceolate scales.

Native Range & Distribution Map

Distribution map showing the native range of Polypodium vulgare 'Elegantissimum'.

Biology & Frond Morphology

Polypodium vulgare 'Elegantissimum' is a diploid (2n = 74) cultivar of the common polypody. The bipinnate to tripinnate frond architecture with serrate pinnule margins represents a complex developmental mutation that affects multiple aspects of frond morphology simultaneously: increased branching of pinna meristems, narrowing of individual segments, and activation of marginal tooth development. The serrate margins distinguish 'Elegantissimum' from most other P. vulgare cultivars and suggest that the mutation affects not only meristem branching but also the expression of marginal differentiation genes. In the wild type, the pinna margins are entire (smooth), and the activation of serration in the cultivar represents the expression of a developmental program that is normally suppressed in P. vulgare but is characteristic of related species such as P. glycyrrhiza. The growth cycle follows the standard P. vulgare evergreen pattern: fronds emerge in late spring to early summer, reach full expansion by mid-summer, and persist through autumn and winter until replaced by new growth the following year. Individual fronds have a lifespan of approximately 10 to 14 months. The finely divided frond morphology increases the surface-area-to-volume ratio compared to the wild type, potentially enhancing light capture in shaded environments while also increasing transpirational water loss. In practice, 'Elegantissimum' performs well in the same dry-shade conditions tolerated by the standard species, suggesting that the increased transpiration is adequately compensated by the rhizome's water storage capacity. Growth is slow and steady, with the rhizome extending approximately 3 to 8 centimeters (1.2–3 inches) per year. The cultivar is propagated exclusively by rhizome division to maintain its distinctive characteristics.

Spore Dispersal

Spore production in 'Elegantissimum' is reduced compared to the wild species, as the finely divided fronds provide less surface area for soral development. When sori are present, they are small and borne on the larger pinnules. The spores are monolete, bilateral, approximately 50 to 65 micrometers in length, with the verrucate perispore characteristic of P. vulgare. Spore release follows the standard pattern, driven by the annulus mechanism during dry periods in late autumn and winter. The evergreen fronds position the ripening sori in the winter air column, where wind dispersal can be effective. Spore-grown offspring of 'Elegantissimum' show variable frond morphology, with most reverting toward the wild-type form. The complex combination of traits (increased division, narrow segments, serrate margins) that defines the cultivar is not reliably transmitted through the sexual generation, as it likely involves multiple genetic factors. However, among populations of spore-raised seedlings, individual plants occasionally show partial expression of one or more of these traits, and such individuals have historically been selected and named as new cultivars. The Victorian practice of raising and screening spore progeny was a deliberate strategy for discovering new ornamental fern forms.

Reproduction & Propagation

Rhizome division is the essential propagation method for maintaining the cultivar's distinctive characteristics. Divide in spring or early autumn, cutting the rhizome into sections of 5 to 8 centimeters (2–3 inches), each bearing at least one frond and roots. Dust cut surfaces with cinnamon and replant immediately in well-drained, acidic substrate. Water gently and provide shade during establishment. Divisions produce new fronds within one growing season. The slow growth rate of P. vulgare means stock building from divisions is a gradual process. Each division typically produces one to three fronds per season, and three to five years of serial division are needed to build significant quantities from a single starting plant. Spore propagation produces variable offspring, predominantly wild-type, though occasional individuals with partial expression of the finely divided, serrate morphology may appear. For growers interested in selecting new variants, raising and screening spore progeny can be a rewarding long-term project. Sharing divisions with fellow fern enthusiasts through pteridological society plant exchanges is the most effective way to ensure the cultivar's continued availability.

Cultivation & Substrate

Polypodium vulgare 'Elegantissimum' inherits the full cultivation tolerance of its parent species, requiring only well-drained, acidic to neutral soil and shade to thrive. The cultivar is suitable for a wide range of garden positions and requires minimal ongoing care. Plant in well-drained soil with a pH of 5.0 to 7.0, enriched with leaf mold and coarse grit. Ideal positions include acidic rock gardens, old walls built with granite or sandstone, the bases of oaks and other acid-bark trees, mossy banks, and shaded woodland borders. The species thrives in the thin, impoverished soils of rock crevices where many other plants struggle. Shade from partial to full is preferred. Some dappled sunlight is tolerated, particularly in cool climates, but sustained direct sun can bleach and dry the delicate frond segments. Watering is minimal once established. P. vulgare is genuinely drought-tolerant, and 'Elegantissimum' requires watering only during extended dry periods in the first growing season after planting. The rhizome's water storage capacity sustains the plant through typical summer dry spells. Fertilization is unnecessary. The slow-growing nature of P. vulgare means it thrives in low-fertility conditions, and excessive nitrogen can produce soft, disease-susceptible growth. An annual light mulch of leaf mold is the only supplementation needed. The cultivar is fully hardy to zone 4a and requires no winter protection. The evergreen fronds persist through the coldest winters without damage.

Common Mistakes to Avoid

Planting in alkaline soil is a common error. P. vulgare is an acid-loving species, and 'Elegantissimum' will struggle in limestone-derived or lime-enriched soils. Test soil pH and amend with peat, pine bark, or sulfur if above 7.0. Waterlogging causes rhizome rot and is the most serious cultural mistake. Ensure excellent drainage at all planting sites. Raised positions on rocks, walls, and banks naturally provide the drainage the species requires. Overfertilization produces rank, weak growth susceptible to fungal attack. Resist the temptation to feed this frern generously; it thrives on lean diets. Exposure to strong, persistent winds damages the finely serrated frond segments, which are more vulnerable to desiccation than the smooth-margined wild type. Plant in sheltered positions. Expecting rapid colony formation is unrealistic. P. vulgare grows slowly, and an impressive colony of 'Elegantissimum' develops over five to ten years from initial planting. The wait is well rewarded. Confusing this cultivar with other finely divided P. vulgare forms such as 'Cornubiense' is possible but can be avoided by noting the distinctive narrow, serrate-margined segments of 'Elegantissimum' versus the broader, entire-margined segments of 'Cornubiense'.

Seasonal Considerations

The seasonal care of 'Elegantissimum' is minimal, following the standard P. vulgare cycle. Spring (March–May): New croziers emerge, the finely divided segments unfurling to reveal the distinctive serrate-margined pinnules. Protect from slugs during emergence. A light mulch of leaf mold provides the year's nutrition. Summer (June–August): Fronds reach full size and create a feathery display. No care is needed. Old fronds from the previous year can be trimmed once new ones are fully expanded. Autumn (September–November): Fronds remain attractive as the garden around them enters dormancy. The contrast between the fresh green polypody fronds and the autumn colors of surrounding deciduous plants is particularly appealing. Winter (December–February): The evergreen fronds persist and provide winter garden interest. Frost decorates the fine segments beautifully. No protection is needed. The total annual care requirement is limited to slug protection in spring and optional tidying of old fronds, making this one of the most low-maintenance ornamental ferns available.

Diseases & Pests

Polypodium vulgare 'Elegantissimum' is exceptionally disease-resistant, as befits a cultivar of one of the toughest fern species in the Northern Hemisphere. Disease problems are virtually nonexistent in well-drained garden conditions. Rhizome rot in waterlogged soils is the sole significant disease risk, entirely preventable through proper drainage. Minor fungal leaf spots may occasionally appear on the fine frond segments during prolonged wet weather, but damage is cosmetic and self-limiting. Slug and snail damage to emerging spring croziers is the most important pest concern. The finely divided, tender developing fronds are highly attractive to mollusks and can be severely damaged before they fully expand. Spring protection with iron phosphate baits or physical barriers is recommended. Vine weevil may damage the rhizome of container-grown plants. Biological control with parasitic nematodes is effective. The species' robust constitution means it recovers readily from minor pest and disease episodes, producing replacement fronds from its vigorous rhizome.

Indoor Growing & Terrariums

Polypodium vulgare 'Elegantissimum' is best appreciated in cool, well-lit indoor environments that approximate outdoor conditions. Heated living rooms are generally too warm and dry for this species, but unheated conservatories, cold porches, enclosed balconies, and cool hallways provide excellent display opportunities. Plant in a small, well-drained container with acidic potting mix. Position where the finely serrated frond segments can be examined at close range, ideally at eye level on a shelf or table. The feathery texture and delicate serration are among the most refined morphological details in the fern kingdom, richly rewarding close observation. Good indirect light is essential. A north- or east-facing window in a cool room provides ideal conditions. The evergreen fronds provide year-round interest, and the slow growth rate means repotting is seldom necessary. Water sparingly, allowing the substrate to dry between applications. The species' drought tolerance is a significant advantage for indoor growers who may water irregularly. For botanical artists and photographers, 'Elegantissimum' provides an outstanding subject. The combination of fine division and serrate margins creates intricate silhouettes when backlit, and the frond architecture repays examination at every magnification from macroscopic to microscopic.

Terrarium Setup

Polypodium vulgare 'Elegantissimum' is a superb subject for a cool, temperate terrarium, where its feathery, serrate-margined fronds can be appreciated at close range. The compact size (fronds 15–35 centimeters) suits terrarium dimensions well. Use an acidic substrate of peat, leaf mold, and coarse grit with a drainage layer beneath. Mount the rhizome on a piece of acidic rock or bark. Maintain cool temperatures (40–60 °F / 5–16 °C) with LED lighting at 2,000 to 3,000 lux for 10 to 12 hours daily. The serrate pinnule margins are a particular delight under terrarium observation, the tiny teeth visible in sharp detail through the glass. Side-lighting emphasizes the three-dimensional quality of the finely divided fronds, creating subtle shadows that enhance the textural effect. Companion species include Asplenium trichomanes, Cystopteris fragilis, and native mosses. Other P. vulgare cultivars displayed alongside 'Elegantissimum' create a comparative collection illustrating the range of natural variation within a single species. Ventilate regularly and water sparingly, taking advantage of the species' drought tolerance.

Landscape & Garden Use

Polypodium vulgare 'Elegantissimum' 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

As a vegetatively propagated cultivar, 'Elegantissimum' depends on continued cultivation for its survival. It is maintained by the British Pteridological Society, specialist fern nurseries, and private collectors throughout Europe and North America. The cultivar is more widely available than some historic Polypodium cultivars but remains uncommon in mainstream horticultural commerce. Sharing divisions among fern enthusiasts is the primary means of distribution and the most effective conservation strategy. The parent species P. vulgare is one of the most abundant ferns in the Northern Hemisphere and faces no conservation concerns. Its extraordinary natural variability, of which 'Elegantissimum' is one expression, continues to produce novel forms in wild populations, though the probability of exactly replicating the 'Elegantissimum' phenotype through natural mutation is vanishingly small.