Back to main Search Page

Gastrodia sesamoides - R.Br.

Potato Orchid

Author	R.Br.	Botanical references	44, 265
Family	Orchidaceae	Genus	Gastrodia
Synonyms
Known Hazards	None known
Range	Australia, New Zealand.
Habitat	Open forest and scrub from the coast to the sub-alpine zone, mainly north of latitude 42°s, in the North and South Islands of New Zealand[44].
Edibility Rating	2 (1-5)	Medicinal Rating	0 (1-5)

Physical Characteristics

Perennial growing to 0.6m.

The plant prefers light (sandy), medium (loamy) and heavy (clay) soils. The plant prefers acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It requires moist soil.

Habitats

Woodland Garden; Sunny Edge; Dappled Shade; Shady Edge;

Edible Uses

Edible Parts: Leaves; Root.

Root - raw or cooked. It resembles a beetroot in flavour but is watery and insipid[46, 61, 144, 173]. The root can be up to 15cm long and 4cm thick[193]. Leaves. Eaten by the Australian Aborigines in Tasmania[193].

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

None known

Other Uses

None known

Cultivation details

We have very little information on this species and do not know if it will be hardy in Britain. A saprophytic herb, it is without green parts and is entirely dependant upon a fungus for its nutriment[144, 238]. This makes it very difficult to cultivate outside its native range. As well as its fungal host, it also requires a damp humus-rich soil in a sheltered woodland position[238]. Orchids are, in general, shallow-rooting plants of well-drained low-fertility soils. Their symbiotic relationship with a fungus in the soil allows them to obtain sufficient nutrients and be able to compete successfully with other plants. They are very sensitive to the addition of fertilizers or fungicides since these can harm the symbiotic fungus and thus kill the orchid[230].

Propagation

Seed - surface sow, preferably as soon as it is ripe, in the greenhouse and do not allow the compost to dry out. The seed of this species is extremely simple, it has a minute embryo surrounded by a single layer of protective cells. It contains very little food reserves and depends upon a symbiotic relationship with a species of soil-dwelling fungus. The fungal hyphae invade the seed and enter the cells of the embryo. The orchid soon begins to digest the fungal tissue and this acts as a food supply for the plant until it is able to obtain nutrients from decaying material in the soil[200]. It is best to use some of the soil that is growing around established plants in order to introduce the fungus, or to sow the seed around a plant of the same species and allow the seedlings to grow on until they are large enough to move. Division in autumn. The plant is very intolerant of root disturbance, any moving or dividing should be attempted in the autumn, keep a large ball of soil around the plant[1].

Links

References

[1] F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956 Oxford University Press 1951
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).

[44] Allan. H. H. Flora of New Zealand. Government Printer, Wellington. 1961
The standard work, in 3 volumes though only the first two are of interest to the plant project. Very good on habitats.

[46] Uphof. J. C. Th. Dictionary of Economic Plants. Weinheim 1959
An excellent and very comprehensive guide but it only gives very short descriptions of the uses without any details of how to utilize the plants. Not for the casual reader.

[61] Usher. G. A Dictionary of Plants Used by Man. Constable 1974 ISBN 0094579202
Forget the sexist title, this is one of the best books on the subject. Lists a very extensive range of useful plants from around the world with very brief details of the uses. Not for the casual reader.

[144] Cribb. A. B. and J. W. Wild Food in Australia. Fontana 1976 ISBN 0-00-634436-4
A very good pocket guide.

[173] Crowe. A. Native Edible Plants of New Zealand. Hodder and Stoughton 1990 ISBN 0-340-508302
A very well written and illustrated book based on the authors own experiments with living on a native diet.

[193] Low. T. Wild Food Plants of Australia. Angus and Robertson. 1989 ISBN 0-207-14383-8
Well presented, clear information and good photographs. An interesting read for the casual reader as well as the enthusiast

[200] Huxley. A. The New RHS Dictionary of Gardening. 1992. MacMillan Press 1992 ISBN 0-333-47494-5
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.

[230] Cribb. P. & Bailes. C. Hardy Orchids. Orchids for the Garden and Frost-free Greenhouse. Christopher Helm. London. 1989 ISBN 0 7470 0416 1
An excellent book looking at the orchids that can be grown outdoors in temperate climates and giving lots of information on how to grow them. Very lttle information on their uses.

[238] Bown. D. Encyclopaedia of Herbs and their Uses. Dorling Kindersley, London. 1995 ISBN 0-7513-020-31
A very well presented and informative book on herbs from around the globe. Plenty in it for both the casual reader and the serious student. Just one main quibble is the silly way of having two separate entries for each plant.

[265] Carolin. R. & Tindale. M. Flora of the Sydney Region Reed. Australia. 1993 ISBN 0730104001
Concise flora with little beyond an extensive key, species descriptions, very brief habitat description.

Readers Comments

Plants for a Future does not verify the accuracy of reader comments, use at your own risk. In particular Plants For A Future can not take any responsibility for any adverse effects from the use of plants. You should always consult a professional before using plants medicinally.

Gastrodia sesamoides

Mal Rickarby Wed Dec 31 2008

Leaves can't be eaten. Propagation is near impossible as this unusual plant coexists with at least three types of fungi, on which it is dependent. It is also a protected plant by law in its natural habitat.

Add a comment/link:

Discussion Monitor

To have posts to this page mailed to you enter your email address here:

(Your email address will not appear on the webpage or be passed on to third parties).