We have over 100,000 visitors each month, but in the whole of 2013 less than £1,000 was raised from donations. We rely on donations and cannot continue to maintain our database and website unless this increases considerably in 2014. Please make a donation today. More information on our financial position >>>
Search Page Content
   Bookmark and Share
   
    By donating to PFAF, you can help support and expand our activities
    Plant Suppliers: Click here for a List

Rheum palmatum tanguticum - Regel.                
                 
Common Name Da Huang
Family Polygonaceae
Synonyms R. tanguticum. (Reg.)Maxim.
Known Hazards Although no specific mention has been seen for this species, the leaves of some if not all members of this genus contain significant quantities of oxalic acid and should not be eaten in any quantity. Oxalic acid can lock up certain minerals in the body, especially calcium, leading to nutritional deficiency. The content of oxalic acid will be reduced if the plant is cooked. People with a tendency to rheumatism, arthritis, gout, kidney stones or hyperacidity should take especial caution if including this plant in their diet since it can aggravate their condition[238]. See Rheum palmatum for possible related information.
Habitats Valleys at elevations of 1600 - 3000 metres in Gansu, Qinghai and Xizang Provinces[266].
Range E. Asia - N.W. China.
Edibility Rating  
Medicinal Rating  
Care
Fully Hardy Moist Soil Semi-shade Full sun

Summary       

Physical Characteristics       
 icon of manicon of flower
Rheum palmatum tanguticum is a PERENNIAL growing to 2 m (6ft) by 0.8 m (2ft 7in).
It is hardy to zone (UK) 6. It is in flower from Jun to July. The flowers are hermaphrodite (have both male and female organs) and are pollinated by Wind.

USDA hardiness zone : Coming soon


Suitable for: medium (loamy) and heavy (clay) soils, prefers well-drained soil and can grow in heavy clay soil. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It prefers moist soil.

Rheum palmatum tanguticum Da Huang


Rheum palmatum tanguticum Da Huang
   
Habitats       
 Cultivated Beds;
Edible Uses                                         
Leaf stem - raw or cooked[2, 7, 105, 183]. The stem is superior in flavour to the common rhubarb and quite tender[2]. An acid flavour, it is sometimes used as a cooked fruit substitute[K].
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.

Anticholesterolemic;  Antiseptic;  Antispasmodic;  Antitumor;  Astringent;  Cholagogue;  Diuretic;  Haemostatic;  Purgative.

Rhubarb has a long and proven history of herbal usage, its main effect being a positive and balancing effect upon the whole digestive system. It is one of the most widely used herbs in Chinese medicine[238]. The root is anticholesterolemic, antiseptic, antispasmodic, antitumor, aperient, astringent, cholagogue, demulcent, diuretic, laxative, purgative, stomachic and tonic[4, 7, 9, 21, 91, 171, 176, 238]. The roots contain anthraquinones, which have a purgative effect, and also tannins and bitters, which have an opposite astringent effect[244]. When taken in small doses, it acts as an astringent tonic to the digestive system, whilst larger doses act as a mild laxative[232, 244]. The root is taken internally in the treatment of chronic constipation, diarrhoea, liver and gall bladder complaints, haemorrhoids, menstrual problems and skin eruptions due to an accumulation of toxins[238]. This remedy is not prescribed for pregnant or lactating women, nor for patients with intestinal obstruction[238]. Externally, the root is used in the treatment of burns[238]. The roots are harvested in October from plants that are at least six years old, they are then dried for later use[4]. A homeopathic remedy is prepared from the dried root[232]. This is used especially in the treatment of diarrhoea in teething children[232].
Other Uses
None known
Cultivation details                                         
Prefers a deep, fertile, moderately heavy, humus rich, moisture retentive, well-drained soil in sun or semi-shade[200]. Grows well in heavy clay soils. Plants can be grown in quite coarse grass, which can be cut annually in the autumn[233]. This is a more robust form of the species[200], it is hardy to at least -15°c[238]. This sub-species is favoured for its medicinal properties over the species[244] and is cultivated as a medicinal plant in China[187]. Plants in this genus seem to be immune to the predations of rabbits[233]. Hybridizes freely with other members of this genus[200].
                                                                                 
Propagation                                         
Seed - best sown in autumn in a shaded cold frame[200]. The seed can also be sown in spring in a cold frame. When large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse or cold frame for their first winter, planting them out in the spring. Division in early spring or autumn[1, 111]. Divide up the rootstock with a sharp spade or knife, making sure that there is at least one growth bud on each division. Larger divisions can be planted out direct into their permanent positions. We have found that it is better to pot up the smaller divisions and grow them on in light shade in a cold frame until they are well established before planting them out in late spring or early summer.
Plant Suppliers: Click here for a List

      You can download this page as a PDF

Expert comment                                         
 
      
Author                                         
Regel.
                                                                                 
Botanical References                                         
200266
                                                                                 
Links / References                                         

  [K] Ken Fern Notes from observations, tasting etc at Plants For A Future and on field trips.

[1]F. Chittendon. RHS Dictionary of Plants plus Supplement. 1956
Comprehensive listing of species and how to grow them. Somewhat outdated, it has been replaces in 1992 by a new dictionary (see [200]).
[2]Hedrick. U. P. Sturtevant's Edible Plants of the World.
Lots of entries, quite a lot of information in most entries and references.
[4]Grieve. A Modern Herbal.
Not so modern (1930's?) but lots of information, mainly temperate plants.
[7]Chiej. R. Encyclopaedia of Medicinal Plants.
Covers plants growing in Europe. Also gives other interesting information on the plants. Good photographs.
[9]Launert. E. Edible and Medicinal Plants.
Covers plants in Europe. a drawing of each plant, quite a bit of interesting information.
[21]Lust. J. The Herb Book.
Lots of information tightly crammed into a fairly small book.
[91]Zhang Jingwei. Alpine Plants of China.
A lovely book with nice pictures. Gives habitats and some details of plant uses.
[105]Tanaka. T. Tanaka's Cyclopaedia of Edible Plants of the World.
The most comprehensive guide to edible plants I've come across. Only the briefest entry for each species, though, and some of the entries are more than a little dubious. Not for the casual reader.
[111]Sanders. T. W. Popular Hardy Perennials.
A fairly wide range of perennial plants that can be grown in Britain and how to grow them.
[171]Hill. A. F. Economic Botany.
Not very comprehensive, but it is quite readable and goes into some a bit of detail about the plants it does cover.
[176]Yeung. Him-Che. Handbook of Chinese Herbs and Formulas.
An excellent Chinese herbal giving information on over 500 species. Rather technical and probably best suited to the more accomplished user of herbs.
[183]Facciola. S. Cornucopia - A Source Book of Edible Plants.
Excellent. Contains a very wide range of conventional and unconventional food plants (including tropical) and where they can be obtained (mainly N. American nurseries but also research institutes and a lot of other nurseries from around the world.
[187]Phillips. R. & Rix. M. Perennials Volumes 1 and 2.
Photographs of over 3,000 species and cultivars of ornamental plants together with brief cultivation notes, details of habitat etc.
[200]Huxley. A. The New RHS Dictionary of Gardening. 1992.
Excellent and very comprehensive, though it contains a number of silly mistakes. Readable yet also very detailed.
[232]Castro. M. The Complete Homeopathy Handbook.
A concise beginner's guide to the subject. Very readable.
[233]Thomas. G. S. Perennial Garden Plants
A concise guide to a wide range of perennials. Lots of cultivation guides, very little on plant uses.
[238]Bown. D. Encyclopaedia of Herbs and their Uses.
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.
[244]Phillips. R. & Foy. N. Herbs
Deals with all types of herbs including medicinal, culinary, scented and dye plants. Excellent photographs with quite good information on each plant.
[266] Flora of China
On-line version of the Flora - an excellent resource giving basic info on habitat and some uses.

Readers comment                                         
 
QR Code

What's this?

This is a QR code (short for Quick Response) which gives fast-track access to our website pages. QR Codes are barcodes that can be read by mobile phone (smartphone) cameras. This QR Code is unique to this page. All plant pages have their own unique code. For more information about QR Codes click here.

1. Copy and print the QR code to a plant label, poster, book, website, magazines, newspaper etc and even t-shirts.
2. Smartphone users scan the QR Code which automatically takes them to the webpage the QR Code came from.
3. Smartphone users quickly have information on a plant directly for the pfaf.org website on their phone.
Rate This Plant                                         
Please rate this plants for how successful you have found it to be. You will need to be logged in to do this. Our intention is not to create a list of 'popular' plants but rather to highlight plants that may be rare and unusual and that have been found to be useful by website users. This hopefully will encourage more people to use plants that they possibly would not have considered before.
     
                                                                                 
Add a comment/link                                         

If you have important information about this plant that may help other users please add a comment or link below. Only comments or links that are felt to be directly relevant to a plant will be included. If you think a comment/link or information contained on this page is inaccurate or misleading we would welcome your feedback at admin@pfaf.org. If you have questions about a plant please use the Forum on this website as we do not have the resources to answer questions ourselves.

* Please note: the comments by website users are not necessarily those held by PFAF and may give misleading or inaccurate information.

Subject : Rheum palmatum tanguticum  
             

Links To add a link to another website with useful info add the details here
Name of Site
URL of Site
Details