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Wardian case

The Wardian case is a sealed glass enclosure, typically framed in wood, designed to cultivate and transport plants in a self-contained humid environment that mimics their natural habitat.^[1]^[2] Invented in 1829 by English physician and botanist Nathaniel Bagshaw Ward, the device arose from an accidental observation: a fern spore germinated and thrived inside a sealed jar containing a dormant moth pupa, demonstrating that plants could flourish without external watering due to internal condensation cycles.^[3]^[1] Ward refined this into portable cases with slanted glass roofs to optimize light and drainage, enabling plants to survive extended journeys unprotected from salt spray, wind, and contamination.^[2]^[4] This innovation transformed 19th-century horticulture by facilitating the safe shipment of tropical and exotic species across oceans, with early successes including orchids from Singapore to London that arrived viable after months at sea.^[4]^[5] Institutions such as the Royal Botanic Gardens, Kew, standardized its use by 1847, shipping thousands of plants annually and aiding global botanical exploration, though it also enabled the spread of non-native species with ecological consequences.^[4]^[1] In Victorian parlors, smaller Wardian cases became fashionable for displaying ferns and orchids, popularizing indoor gardening before modern heating systems.^[1]^[3] The design's principles of enclosed ecosystems prefigured contemporary terrariums and continue to influence plant propagation techniques.^[5]

Invention and Early Development

Accidental Discovery by Nathaniel Ward

In 1829, Nathaniel Bagshaw Ward, a London-based physician and amateur botanist, accidentally observed the viability of plants in a sealed glass environment while attempting to rear a moth from its cocoon.^[6] Ward placed the cocoon in a tall, closed glass bottle containing moist soil and fern fronds, sealing it to maintain humidity and protect against London's heavily polluted air, which had thwarted his prior efforts to germinate fern spores outdoors.^[6] Over several months, without any external watering or care, a fern seedling emerged from the soil and flourished, with moisture recycling through evaporation and condensation on the glass walls, which then dripped back to the earth.^[6] This self-sustaining cycle persisted for three years, demonstrating that certain plants could thrive in an enclosed, airtight system shielded from external contaminants.^[6] The discovery stemmed from Ward's dual interests in entomology and pteridology (fern study), amid early 19th-century urban challenges like coal smoke that acidified rain and rendered open-air cultivation difficult for delicate species.^[5] Rather than a deliberate experiment, the event occurred serendipitously when Ward, frustrated by failed germination attempts, repurposed the sealed bottle originally for the pupa.^[3] Upon noticing the healthy growth, Ward hypothesized that the closed container created a micro-ecosystem where carbon dioxide, oxygen, and water balanced naturally via photosynthesis and transpiration, independent of ambient conditions.^[5] This insight, verified through the bottle's long-term stability, marked the foundational principle of what would become the Wardian case, though Ward initially documented it privately before broader experimentation.^[3] Following his 1829 observation of a self-sustaining fern in a sealed bottle, Nathaniel Bagshaw Ward constructed larger wooden-framed glass cases to systematically test enclosed plant cultivation. These early prototypes, typically measuring about 2 feet high and 1.5 feet wide, housed ferns and associated soil, demonstrating sustained growth without external watering for periods exceeding several months due to internal moisture recycling via condensation and evaporation.^[6] Ward experimented with these cases in London's polluted environment, where open-air cultivation often failed; plants like Pteris aquilina thrived inside, protected from soot and acidic rain, confirming the cases' utility for urban horticulture. He refined sealing techniques using putty and wooden joints to minimize air exchange, while positioning cases to optimize sunlight penetration without overheating, and tested varying plant densities to balance humidity and prevent mold.^[7]^[5] By 1833, Ward adapted the design for maritime transport, incorporating reinforced frames and strategic packing to withstand shipboard conditions. Two cases loaded with ferns, mosses, and grasses were shipped from London to Sydney, enduring a six-month voyage exposed to salt spray and irregular handling; upon arrival, the contents remained viable and resumed growth immediately after opening.^[1]^[8] These trials revealed the need for further refinements, including angled lids for better ventilation post-transport and selective perforations covered in fine mesh to control excess humidity without compromising the ecosystem. Success rates exceeded 90% in subsequent local tests, contrasting sharply with prior open-box methods that yielded under 10% survival for similar species over equivalent durations.^[6]

First Public Demonstrations

The first public demonstrations of the Wardian case highlighted its capacity to maintain viable plants over extended periods without external intervention. In June 1833, Nathaniel Bagshaw Ward arranged for two wooden-framed, glazed cases—each filled with British ferns, grasses, mosses, and soil—to be shipped from London to Sydney, Australia, aboard the emigrant vessel Persian. Positioned on the open deck and exposed to salt spray and weather during the approximately eight-month voyage, the contents arrived in robust health, with plants continuing to grow upon opening.^[6]^[1]^[9] This voyage, coordinated with nurseryman Conrad Loddiges and entrusted to Captain Mallard, served as a practical proof-of-concept, contrasting sharply with prior plant transport failure rates exceeding 95 percent due to desiccation and contamination.^[10] The outcome was disseminated among botanists, affirming the sealed ecosystem's role in humidity retention and atmospheric purification, which shielded delicate specimens from maritime perils.^[11] Subsequent demonstrations reinforced these findings, including shipments to other regions and displays to scientific societies, paving the way for broader endorsement. Ward documented early results in communications to figures like William Jackson Hooker, director of Kew Gardens, by 1836, and elaborated in papers preceding his 1842 publication On the Growth of Plants in Closely Glazed Cases.^[11] These efforts transitioned the invention from private experimentation to a publicly validated tool for botanical exchange.^[3]

Design and Functionality

Physical Construction

The Wardian case features a rectangular wooden frame supporting panes of glass on the sides and roof, forming an enclosed, box-like structure resembling a miniature greenhouse.^[1]^[6] This design, developed by Nathaniel Bagshaw Ward in 1829, prioritizes airtight sealing to maintain internal humidity and prevent external contaminants, with the glass allowing sunlight penetration essential for photosynthesis.^[1] Early constructions emphasized durability for transport, incorporating horizontal wooden battens along the glass surfaces to protect against breakage and secure potted plants within.^[6] The base typically accommodated soil or individual pots, elevated by feet in later models to insulate from damp surfaces during sea voyages. Ventilation was minimal or absent in the original airtight iterations, relying on the sealed ecosystem for air quality, though subsequent versions added side air holes covered in perforated zinc to regulate gas exchange without compromising the microclimate.^[6]^[1] Dimensions varied by purpose, with transport cases often compact—capable of holding up to 28 plants by the 1840s—while larger decorative variants emerged for horticultural display.^[6] The wooden components provided structural rigidity and weather resistance, typically crafted from treated timber to withstand prolonged exposure in ship holds.^[1] Metal reinforcements, such as hinges for access panels, enhanced longevity, though the core reliance on wood and glass persisted across 19th-century production.^[6]

Self-Sustaining Ecosystem Mechanism

The Wardian case functions as a closed-loop ecosystem primarily through the recycling of water via plant transpiration and atmospheric condensation. Plants within the sealed glass enclosure absorb moisture from the soil through their roots and release it as vapor during transpiration from leaf stomata. This vapor rises and condenses on the cooler interior glass surfaces, forming droplets that gravity returns to the soil, effectively mimicking the hydrological cycle on a miniature scale and sustaining soil moisture for extended durations without external watering.^[12]^[1]^[13] Gaseous equilibrium is maintained through complementary photosynthesis and respiration processes. During exposure to light, plants and algae in the system consume carbon dioxide and release oxygen via photosynthesis, while at night or in low-light conditions, respiration by plants, roots, and soil microorganisms consumes oxygen and produces carbon dioxide, fostering a balanced atmospheric composition within the enclosure. Layers of sphagnum moss and activated charcoal in the base further support this by retaining excess moisture, suppressing pathogens, and adsorbing organic impurities to prevent stagnation and anaerobic decay.^[6]^[14] This mechanism relies on careful initial setup, including selection of humidity-tolerant species like ferns and orchids, and positioning to receive diffuse light that drives photosynthesis without overheating the interior. Empirical observations confirmed its efficacy, with plants surviving voyages of several months—such as the 1840 shipment of orchids from Singapore to London—where open-air transport previously yielded near-total mortality. However, indefinite sustainability is limited by gradual nutrient depletion in the soil and potential algal overgrowth if light exposure imbalances the cycles.^[1]^[6]

Adaptations for Transport

The Wardian case's design was particularly suited to long-distance maritime transport through its airtight, glazed enclosure, which protected plants from corrosive salt spray, gales, and rain while allowing sunlight exposure when lashed to open decks.^[1]^[6] The self-regulating moisture cycle—driven by plant transpiration and condensation on glass surfaces—minimized care needs, with cases often requiring irrigation only once during multi-month voyages, even under temperature extremes from -7°C to 40°C.^[1]^[8] Practical modifications enhanced durability for sea conditions, including horizontal wooden battens to safeguard glazing against breakage, perforated zinc vents for limited airflow without compromising the seal, and raised feet to insulate bases from wet or soiled deck surfaces.^[6] These features addressed prior failures in plant shipments, where exposure to shipboard elements resulted in survival rates as low as 1 in 1,000; Wardian cases achieved near-complete viability for humidity-tolerant species like ferns and mosses.^[1] The inaugural transport trial occurred in July 1833, when Nathaniel Ward dispatched two cases loaded with British ferns, grasses, and mosses from London to Sydney, Australia; after a six-month passage with decks awash in spray, the cargo arrived robust, having been opened just once mid-voyage for inspection.^[8]^[1] A return shipment in 1834 confirmed bidirectional efficacy, with Australian coral ferns thriving despite reversed climatic stresses.^[1] Further adaptations supported colonial botany from the 1840s, as the Royal Botanic Gardens at Kew employed cases for exporting economic species; examples include six cases of ornamentals and coffee plants to Egypt in 1835, and botanist Robert Fortune's 1848 smuggling of roughly 20,000 Camellia sinensis tea seedlings from China to Indian plantations, which shattered Beijing's export monopoly and enabled Assam tea cultivation.^[1]^[6] Similar shipments disseminated cinchona for quinine, rubber trees, and bananas to British holdings in India, Java, and Samoa, with Kew documenting over 100 such consignments by mid-century.^[1]

Historical Applications

Long-Distance Plant Shipment

The Wardian case facilitated the long-distance shipment of live plants by creating a sealed, self-regulating microclimate that protected specimens from salt spray, excessive evaporation, and fluctuating conditions during extended sea voyages. Prior to its development, plant transport success rates were dismal, with approximately one in twenty specimens surviving journeys due to inadequate protection and care. The device's design reversed this, achieving survival rates of nineteen out of twenty plants after months at sea, as demonstrated in early trials and commercial applications.^[2]^[15]^[6] Nathaniel Ward conducted the inaugural long-distance test in 1833, dispatching two cases loaded with ferns, mosses, and grasses from London to Sydney, Australia—a six-month voyage exposed to open deck conditions. Upon arrival, the plants emerged healthy and vigorous, with minimal intervention beyond initial sealing and occasional ventilation. This outcome validated the case's efficacy and spurred its use by nurseries and botanical institutions for transoceanic shipments.^[8]^[16]^[1] By 1847, the Royal Botanic Gardens, Kew, integrated Wardian cases into routine operations, employing standardized wooden-and-glass units capable of holding 28 plants each for exports to British colonies. These shipments targeted tropical and subtropical regions, including India and Australia, enabling the establishment of plantations for cash crops such as tea—initially sent from China via Kew to Assam in the 1830s—and cinchona for quinine production. Nurseryman Conrad Loddiges further applied the cases in 1834 for consignments to Australia, while later voyages on vessels like the SS Great Britain sustained plants across two-month Atlantic crossings with watering limited to once per trip.^[4]^[17]^[18] The technology's reliability extended to delicate species like orchids and economic staples such as rubber, with cases often returned empty after unloading to reuse for reverse shipments of native flora to Europe. This bidirectional flow supported imperial botany but required careful species selection, as not all plants thrived in the humid, light-limited confines; successes were empirically verified through arrival reports from recipients, contrasting sharply with pre-Wardian failures documented in explorer logs.^[1]^[19]

Role in Victorian Horticulture

The Wardian case played a pivotal role in Victorian horticulture by enabling the indoor cultivation and display of delicate exotic plants, particularly during the pteridomania—the fern craze that peaked from the 1840s to the 1860s. These sealed glass enclosures created a stable, humid microenvironment that sustained ferns and tropical species in Britain's often inhospitable climate, allowing middle-class households to maintain collections without relying on costly heated greenhouses.^[20] By 1831, experimenters had successfully grown 30 fern species in such cases, accelerating the trend toward domestic fern cultivation.^[21] This innovation aligned with the era's burgeoning interest in ornamental gardening, where Wardian cases served both as transport vessels and decorative fixtures in parlors and conservatories. Fashionable homes routinely incorporated them to showcase rare ferns like Adiantum capillus-veneris or Nephrolepis exaltata, fostering a culture of plant collecting among amateurs and professionals alike.^[22]^[23] The cases' portability and self-regulating ecosystem—relying on condensation cycles for moisture—made exotic horticulture more accessible, supporting the proliferation of fern societies and specialized nurseries.^[24] Beyond ferns, Wardian cases extended to orchids and other tender plants, enhancing private collections and botanical experimentation. Their adoption by institutions like the Royal Botanic Gardens, Kew—where standard cases held up to 28 plants by 1847—underscored their utility in propagating diverse species for wider horticultural distribution.^[4] This influx of viable imports diversified Victorian gardens, from urban window displays to expansive estates, and stimulated economic activity in plant breeding and sales.^[1]

Contributions to Economic Botany

The Wardian case revolutionized the global dissemination of economically valuable plants by enabling their viable transport over long sea voyages, which previously resulted in near-total mortality rates due to desiccation and poor conditions. This innovation supported the establishment of plantations for cash crops, thereby enhancing colonial economies and reducing dependency on monopolistic suppliers. Key examples include the relocation of Camellia sinensis tea plants from China to India, where botanist Robert Fortune utilized Wardian cases in 1848 to smuggle over 20,000 seedlings, laying the groundwork for the Assam and Darjeeling tea industries that supplanted China's export dominance.^[11]^[16] Similarly, the case facilitated the transfer of Cinchona species from South America to British territories in India, Sri Lanka, and Java starting in 1860, when Clements Markham employed sealed cases to bypass export restrictions and propagate quinine-producing trees. Quinine, derived from the bark, became essential for malaria prophylaxis, supporting labor-intensive colonial enterprises like railway construction and mining while generating substantial revenue through controlled production.^[13]^[19] For rubber (Hevea brasiliensis), Wardian cases were instrumental in shipping seeds and seedlings from Brazil to Southeast Asia in the 1870s, enabling the development of vast plantations in Malaya and Indonesia that fueled the global tire and industrial rubber boom by the early 20th century. These transfers not only diversified supply chains but also amplified agricultural output, with rubber exports from British Malaya reaching over 600,000 tons annually by 1940, underscoring the case's role in scaling economic botany beyond ornamental horticulture.^[17]^[13] Additional contributions extended to tropical commodities like coffee and sugarcane, whose successful acclimatization in new regions via Wardian transport bolstered trade volumes and food security, though these often prioritized imperial interests over indigenous ecosystems. Overall, the device's self-regulating microclimate minimized losses to under 1% on voyages lasting months, compared to 98% failure rates pre-1830s, directly correlating with expanded botanical resources for medicine, beverages, and industry.^[19]^[1]

Broader Impacts

Positive Economic and Scientific Outcomes

The Wardian case dramatically improved plant survival rates during long-distance sea voyages, rising from approximately 1 in 20 to 19 in 20, which revolutionized the viability of international plant trade and agriculture.^[19] This advancement enabled the successful shipment of economically vital crops, such as the Cavendish banana, which was distributed globally by organizations like the Horticultural Society, fostering new agricultural industries in tropical regions.^[19] Similarly, rubber seeds smuggled from Brazil to East Asia in the late 19th century undermined Brazil's monopoly, stimulating rubber production and export economies in Southeast Asia.^[19] In the realm of cash crops, the case facilitated the transfer of tea plants from China to India in the 1840s, with explorer Robert Fortune overseeing the shipment of around 20,000 plants, thereby breaking China's near-monopoly and establishing India as a major tea producer that supported British colonial economies and generated widespread livelihoods.^[19] Cinchona trees, the source of quinine, were transported to British and Dutch colonies, reducing malaria mortality among workers and enabling expanded tropical plantations for tea, coffee, and rubber, which in turn bolstered national economies through increased agricultural output and trade.^[19]^[8] Commercial nurseries also profited, as exemplified by George Loddiges' deployment of 500 cases for international shipments starting in 1833, which expanded markets for ornamental plants like orchids and rhododendrons.^[8] Scientifically, the Wardian case advanced botanical exploration by allowing the safe delivery of live specimens for study and cultivation. In 1841, Joseph Hooker dispatched plants including Corokia buddleioides, Alseuosmia, Laurus tawa, and Laurus tarairi from New Zealand and the Falkland Islands, which arrived viable at Kew Gardens in March 1843, enriching collections for taxonomic and physiological research.^[6] By 1847, Kew employed cases each accommodating about 28 plants, providing access to rare species that enhanced understanding of plant adaptation, distribution, and self-sustaining ecosystems under controlled humidity and light.^[6] This technology supported economic botany by enabling the propagation and analysis of medicinal and utilitarian plants, contributing to advancements in horticulture and global plant science over nearly a century of use at institutions like Kew.^[6]

Unintended Ecological and Agricultural Disruptions

The Wardian case's ability to transport live plants over long distances inadvertently facilitated the global spread of invasive species and associated biota, disrupting native ecosystems and agricultural systems. By enclosing plants with soil and moisture, the cases preserved not only the intended specimens but also hitchhiking insects, fungi, pathogens, and soil organisms, which often escaped control upon arrival in new environments. In fragile ecosystems such as those of Australia and New Zealand, these introductions altered landscapes by outcompeting native flora and fauna.^[24]^[25] A notable example involves bramble (Rubus spp.), a thorny perennial shrub transported in Wardian cases aboard ships like the SS Great Britain to Australia during the Victorian era. Upon release into gardens and wild areas, bramble proliferated via vegetative reproduction from rooting shoot tips, forming dense thickets that smothered native vegetation, reduced biodiversity, and hindered land use for grazing and agriculture. Over 1,350 Rubus species exist, many exhibiting aggressive growth that exacerbated soil erosion and habitat fragmentation in introduced regions.^[26] Agricultural disruptions were equally severe, as pathogens and pests arrived embedded in the transported root systems. Coffee rust fungus (Hemileia vastatrix), likely disseminated through live plant shipments including those in Wardian cases, ravaged Ceylon's (modern Sri Lanka) coffee plantations starting in 1869, destroying up to 90% of crops within years and forcing a shift to tea cultivation, which reshaped the island's economy and ecology. In the United Kingdom, approximately nine out of ten invertebrate pests were introduced via live plants, underscoring the cases' role in enabling pest invasions that damaged crops and required ongoing chemical controls.^[25] These ecological exchanges contributed to broader biotic homogenization, where monoculture plantations vulnerable to novel pests supplanted diverse native systems, amplifying long-term vulnerabilities. Ironically, by the 1920s, Wardian cases were repurposed to import biological control agents, such as the cactus moth (Cactoblastis cactorum) to Australia in 1925, to combat invasive prickly pear cactus (Opuntia spp.)—itself an earlier ornamental introduction that had overrun millions of hectares of farmland and rangeland. Such measures highlight the persistent legacy of unintended disruptions, with ongoing management costs for invasive species management worldwide exceeding billions annually.^[24]^[25]^[27]

Modern Relevance and Evolution

Influence on Terrariums and Indoor Gardening

The Wardian case's sealed glass enclosure, which created a humid, self-regulating microclimate for plants, served as the direct precursor to modern terrariums by demonstrating the feasibility of enclosed ecosystems for cultivation. Invented by Nathaniel Bagshaw Ward in 1829 following an accidental observation of a thriving fern in a sealed container, the device shifted from transport applications to domestic use in Victorian parlors, where it protected sensitive species like ferns from London's industrial air pollution.^[3]^[28] This popularity fueled the mid-19th-century pteridomania craze, with Wardian cases—often elaborately designed and scaled to furniture dimensions such as tallboys—becoming standard fixtures in affluent homes for growing exotic and tropical plants indoors. By enabling reliable propagation without frequent intervention, these cases encouraged broader experimentation in indoor horticulture, influencing the integration of glasshouses and vivariums into everyday living spaces.^[11]^[1] The principles of the Wardian case persist in contemporary terrariums, which adapt its airtight, moisture-retaining structure for low-maintenance indoor gardening, particularly with moisture-loving plants like mosses and tropical species. Modern iterations, revived during the 1970s houseplant boom, emphasize decorative self-sufficiency, echoing Ward's innovation while incorporating variations like open or bioactive setups for diverse biomes.^[13]

Contemporary Uses in Conservation and Commerce

In contemporary horticulture, Wardian case designs have evolved into commercial terrariums marketed for indoor plant cultivation, particularly for species requiring high humidity such as ferns, orchids, and tropical foliage. These modern replicas, often featuring wooden frames and glass enclosures, create self-regulating microenvironments that minimize watering needs and protect against pests, appealing to urban gardeners and interior designers. Companies produce them in various sizes, from tabletop models to freestanding units capable of housing larger plants, with sales emphasizing aesthetic Victorian-inspired decor alongside functional benefits like air purification.^[29]^[30] For instance, artisan vendors offer customizable pieces using sustainable woods and BPA-free trays for propagation, generating revenue through e-commerce platforms where they retail for $100 to over $1,000 depending on craftsmanship and scale.^[31]^[32] In conservation efforts, Wardian cases see limited direct application today, supplanted by advanced techniques like in vitro propagation and climate-controlled shipping containers for long-distance plant transfers. However, botanic gardens preserve original 19th-century cases as artifacts—Kew Gardens holds eight of the 19 known surviving examples worldwide—and employ modern adaptations for short-term quarantine or display of vulnerable species in controlled humidity.^[6] These setups aid ex situ preservation by mimicking the sealed ecosystem that sustains delicate specimens during acclimation or public exhibition, as demonstrated in educational workshops where participants construct replicas to propagate rare ferns or mosses.^[33] Such uses underscore the enduring principle of enclosed, low-maintenance habitats, though empirical data on survival rates in contemporary contexts remains anecdotal compared to historical benchmarks where cases achieved over 90% plant viability during sea voyages.^[1]

References

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Take for example the Wardian case, named after its inventor, Dr Nathaniel Bagshaw Ward. Dr Ward managed to grow a grass seedling in an air-tight jar ...
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Jun 4, 2019 · In 1830, Ward accidentally discovered that plants, especially ferns, happily grow and flourish in glass boxes that are almost airtight (or, as ...
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Jul 15, 2019 · When two wooden boxes carefully packed with ferns and grasses survived the six-month ocean journey from London to Sydney in 1833, ...
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Ward created the first Wardian cases – in essence, miniature sealed greenhouses protected by a wooden frame with carrying handles.
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The Wardian case was invented by Dr. Ward in 1829. The case allowed the plants to get the sunlight they needed, but protected them from the wind and rain.
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Botanist and fern collector Nathaniel Bagshaw Ward discovered the Wardian case which has become what we know now as a terrarium.
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Mar 7, 2024 · Each sealed Wardian case created its own microclimate, allowing plants to survive despite only being watered once during a two-month crossing.
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Feb 11, 2020 · As an experiment, Ward arranged to ship two cases of plants to Australia. Several months later came a letter from the ship's captain ...
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Jun 12, 2015 · Many fashionable homes boasted a Wardian case (a glass case similar to a terrarium) to display a collection of ferns. A host of books appeared ...
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Jul 22, 2022 · By 1831, they had grown thirty fern species in the Wardian cases. Overall, the Wardian case allowed plants from all over the world to be brought ...
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Jul 16, 2021 · Wardian cases were developed for indoor ferns during 'pteridomania,' a craze for collecting and growing ferns, which were also a fashionable ...
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Aug 22, 2017 · Such a miniature woodland can be found on the windowsill of the children's room at Vaucluse House, where a c.1880 Wardian Case is on display.
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Some of the plants that were transported across the world inside Wardian cases during the Victorian era had detrimental consequences on the landscapes.
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Mar 16, 2024 · And most importantly, they can all actually be used for a functional terrarium. Here are the main platforms to find Wardian Cases for sale ...<|separator|>
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Wardian cases are mini glasshouses that were used in the Victorian times to transport plants around the world. Join us in the Garden to create your own ...