Practical
Plants

Dryopteris carthusiana

Narrow Buckler Fern

a member of the Dryopteris genus in the family Dryopteridaceae.

No photo available

Taxonomy and growth

Height
1 m
Spread
0.5 m

Uses

Toxicity

Toxicity warning. The historical record reports a hazard for this plant. Do not use it to decide which parts are safe to eat or use medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

Although we have found no reports for this species, a number of ferns contain carcinogens so some caution is advisable[6]. 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[3]. 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

This section contains historical Plants For A Future notes marked noncommercial.

Root - baked[13]. Some caution is advised, see notes above on toxicity. Old leafstalks on the underground stems can be roasted, peeled and the inner portion eaten[11]. Young curled fronds, harvested as they are developing in the spring, can be boiled and eaten like asparagus[11].

Plant part
Leaves
Plant part
Root

Medicinal uses

Historical medicinal uses. These records describe reported uses. They do not establish safety or effectiveness. Ask a qualified health professional before using any plant medicinally.

This section contains historical Plants For A Future notes marked noncommercial.

The root contains 'filicin', a substance that paralyses tapeworms and other internal parasites and has been used as a worm expellent[12][8][10]. 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[10]. An oily purge, such as caster oil, increases the absorption of the fern root and can be dangerous[10]. The root is harvested in the autumn and can be dried for later use, it should not be stored for longer than 12 months[10]. This remedy should be used with caution and only under the supervision of a qualified practitioner[10]. The root is toxic and the dosage is critical[10]. See also the notes above on toxicity.

Product or use
Vermifuge

Material uses

This section contains historical Plants For A Future notes marked noncommercial.

When spaced about 30cm apart each way, the plants can be grown as a ground cover[7].

Ecology and functions

Ecosystem niche
Soil surface

Environment

Range
Europe, including Britain, from Scandanavia south and east to Spain and Siberia. N. America..
Habitat
Damp and wet woods, marshes and wet heaths[2].
Shade tolerance
partial shade
Water
high
Hardiness
Zone 5+
Soil textures
sandy, loamy, clay
Soil pH
acid, neutral
Tolerates Nutritionally Poor Soil
No
Drought
intolerant

Propagation

This section contains historical Plants For A Future notes marked noncommercial.

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.

Cultivation

This section contains historical Plants For A Future notes marked noncommercial.

Prefers an acid to neutral soil, succeeding in ordinary fertile soil in a shady position[4][6]. Requires permanently moist conditions at its roots. A very ornamental plant[1], it is often evergreen in mild winters[5]. Plants spread slowly at the rootstock[9]. Members of this genus are rarely if ever troubled by browsing deer[9].

References

  1. F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951-00-00

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  2. Clapham, Tootin and Warburg. Flora of the British Isles. Cambridge University Press 1962-00-00

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  3. Schofield. J. J. Discovering Wild Plants - Alaska, W. Canada and the Northwest.

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  4. Bird. R. (Editor) Focus on Plants. Volume 5. (formerly 'Growing from seed') Thompson and Morgan. 1991-00-00

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  5. Brickell. C. The RHS Gardener's Encyclopedia of Plants and Flowers Dorling Kindersley Publishers Ltd. 1990-00-00 ISBN 0-86318-386-7

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  6. Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992-00-00 ISBN 0-333-47494-5

    ↩1↩2

  7. Thomas. G. S. Plants for Ground Cover J. M. Dent & Sons 1990-00-00 ISBN 0-460-12609-1

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  8. Foster. S. & Duke. J. A. A Field Guide to Medicinal Plants. Eastern and Central N. America. Houghton Mifflin Co. 1990-00-00 ISBN 0395467225

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  9. Thomas. G. S. Perennial Garden Plants J. M. Dent & Sons, London. 1990-00-00 ISBN 0 460 86048 8

    ↩1↩2

  10. Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995-00-00 ISBN 0-7513-020-31

    ↩1↩2↩3↩4↩5↩6

  11. Moerman. D. Native American Ethnobotany Timber Press. Oregon. 1998-00-00 ISBN 0-88192-453-9

    ↩1↩2

  12. Grieve. A Modern Herbal. Penguin 1984-00-00 ISBN 0-14-046-440-9

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  13. Usher. G. A Dictionary of Plants Used by Man. Constable 1974-00-00 ISBN 0094579202

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