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Uses

Toxic parts

Although we have found no reports for this species, a number of ferns contain carcinogens so some caution is advisable[1]. The fresh plant contains thiaminase, an enzyme that robs the body of its vitamin B complex. In small quantities this enzyme will do no harm to people eating an adequate diet that is rich in vitamin B, though large quantities can cause severe health problems. The enzyme is destroyed by heat or thorough drying, so cooking the plant will remove the thiaminase[2]. However, there have been reports for other species of ferns suggesting that even cooked fronds can have a long term harmful effect. Some caution is therefore advised.

Edible uses

Notes

Young fronds[3]. No further details, but we would advise caution. See the notes above on toxicity.

Leaves

Material uses

There are no material uses listed for Dryopteris crassirhizoma.

Medicinal uses(Warning!)

The root stalks are analgesic, antibacterial, anti-inflammatory, antiviral, astringent, febrifuge, haemostatic, vermifuge and vulnerary[4][5]. A decoction of the dried root is depurative and resolvent[6]. The root contains 'filicin', a substance that paralyses tapeworms and other internal parasites and has been used as a worm expellent for humans and also in veterinary medicine[6][4]. It is one of the most effective treatments known for tapeworms - its use should be immediately followed by a non-oily purgative such as magnesium sulphate in order to expel the worms from the body[4]. An oily purge, such as caster oil, increases the absorption of the fern root and can be dangerous[4]. The root is also taken internally in the treatment of internal haemorrhage, uterine bleeding, mumps and feverish illnesses[4]. The root is harvested in the autumn and can be dried for later use, it should not be stored for longer than 12 months[4]. This remedy should be used with caution and only under the supervision of a qualified practitioner[4]. The root is toxic and the dosage is critical[4]. See also the notes above on toxicity. Externally, the root is used in the treatment of abscesses, boils, carbuncles and sores[4].

Ecology

Ecosystem niche/layer

Ecological Functions

Nothing listed.

Forage

Nothing listed.

Shelter

Nothing listed.

Propagation

Spores - can be sown at any time of the year in a greenhouse. Surface sow on a sterilised compost and keep moist, possibly by placing the pot in a plastic bag. Germinates in 1 - 3 months at 20°c. Pot up small clumps of the plants when they are large enough to handle and grow on in a shady part of the greenhouse until large enough to plant out. Division in spring. Larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.

Practical Plants is currently lacking information on propagation instructions of Dryopteris crassirhizoma. Help us fill in the blanks! Edit this page to add your knowledge.



Cultivation

Prefers an acid to neutral soil, succeeding in ordinary fertile soil in a shady position[7][1]. Prefers a moist soil[8], but is drought tolerant when well established[1]. Members of this genus are rarely if ever troubled by browsing deer[9].

Crops

Problems, pests & diseases

Associations & Interactions

There are no interactions listed for Dryopteris crassirhizoma. Do you know of an interaction that should be listed here? edit this page to add it.

Polycultures & Guilds

There are no polycultures listed which include Dryopteris crassirhizoma.

Descendants

Cultivars

Varieties

None listed.

Subspecies

None listed.

Full Data

This table shows all the data stored for this plant.

Taxonomy
Binomial name
Dryopteris crassirhizoma
Genus
Dryopteris
Family
Dryopteridaceae
Imported References
Edible uses
Medicinal uses
Material uses & Functions
Botanic
Propagation
Cultivation
Environment
Cultivation
Uses
Edible uses
None listed.
Material uses
None listed.
Medicinal uses
None listed.
Functions & Nature
Functions
Provides forage for
Provides shelter for
Environment
Hardiness Zone
6
Heat Zone
?
Water
moderate
Sun
Shade
partial shade
Soil PH
Soil Texture
Soil Water Retention
Environmental Tolerances
  • Drought
Ecosystems
Native Climate Zones
None listed.
Adapted Climate Zones
None listed.
Native Geographical Range
None listed.
Native Environment
None listed.
Ecosystem Niche
None listed.
Root Zone Tendancy
None listed.
Life
Deciduous or Evergreen
?
Herbaceous or Woody
?
Life Cycle
?
Growth Rate
?
Mature Size
1 x meters
Fertility
?
Pollinators
?
Flower Colour
?
Flower Type











References

  1. ? 1.01.11.21.3 Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press ISBN 0-333-47494-5 (1992-00-00)
  2. ? Schofield. J. J. Discovering Wild Plants - Alaska, W. Canada and the Northwest. ()
  3. ? 3.03.1 Kunkel. G. Plants for Human Consumption. Koeltz Scientific Books ISBN 3874292169 (1984-00-00)
  4. ? 4.04.14.24.34.44.54.64.74.84.9 Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. ISBN 0-7513-020-31 (1995-00-00)
  5. ? 5.05.1 Medicinal Plants in the Republic of Korea World Health Organisation, Manila ISBN 92 9061 120 0 (1998-00-00)
  6. ? 6.06.16.2 Duke. J. A. and Ayensu. E. S. Medicinal Plants of China Reference Publications, Inc. ISBN 0-917256-20-4 (1985-00-00)
  7. ? Bird. R. (Editor) Focus on Plants. Volume 5. (formerly 'Growing from seed') Thompson and Morgan. (1991-00-00)
  8. ? Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. ISBN 0-86318-386-7 (1990-00-00)
  9. ? Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. ISBN 0 460 86048 8 (1990-00-00)
  10. ? www.foj.info Flora of Japan ()

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