quinta-feira, 4 de abril de 2013

Elaeagnus x ebbingei - A Plant for all Reasons


Elaeagnus ebbingei
Some plants are so exciting and have so much potential for the permaculture grower, that I really cannot understand why they are not better known. Just one such plant is Elaeagnus x ebbingei. This hybrid species of garden origin, the result of a cross between E. macrophylla and E. pungens (or perhaps E. x reflexa), is commonly grown as a garden ornamental - in the future I hope it will be extensively grown as a multi-purpose plant in many permaculture systems.

Relatives

Before I go into specific details of this plant, I would like to take a brief look at some of the plants that are related to it. E. x ebbingei belongs to the family Elaeagnaceae. This is a fairly small family comprising just three genera and fifty or so species, yet it contains a very high percentage of plants for permaculture. All of the species, for example, have potentially edible fruits, though in some cases they are not that desirable. 

The three genera are:-

Elaeagnus: This contains about 45 species of evergreen and deciduous shrubs, some of which become scrambling climbers when planted under trees. Possibly the best known of those grown for their fruit are E. multiflora (the Goumi) and E. angustifolia (the winter olive). Ten species and 15 cultivars are currently offered in British nurseries, all of them as ornamental plants. I do not know of any nursery offering cultivars that have been developed for their fruit.

Hippophae: The latest research says that there are 7 quite closely related species in this genus. H. rhamnoides is our native sea buckthorn and this is often cultivated in N. Europe and China for its fruit. This fruit is very rich in vitamin C and many other nutrients, but is too acid for most tastes (rather like a very acid lemon). It does make a superb fruit juice and can also be added to other fruit juices. The Asiatic species H. salicifolia has become the centre of a multi-million pound industry in Nepal and China where it is cultivated as a fruit crop, a medicinal plant and for a wide range of other uses. These are the only species currently offered in British nurseries.

Shepherdia: There are just two species in this genus. They are very closely related to Elaeagnus differing mainly in having opposite instead of alternate leaves and also having dioecious flowers (all male flowers on some plants and all female flowers on others). This genus probably produces the least interesting fruit of the family. Only one species is currently available in British nurseries.Whilst all members of this family produce edible fruits, those of Shepherdia contain saponins and can cause poisoning. Saponins are in fact to be found in several of the foods that we eat (including beans). They are poorly absorbed by the body and are also destroyed by heat so cases of poisoning are rare. Nevertheless they should be treated with some caution. Saponins have the ability to lather up in water and can be used as soap substitutes - for which reason one of these species has a common name of soap berry.

Other Uses.The family as a whole contains many plants of interest to the permaculturalist. Apart from producing edible fruits, most species also have a wide range of other uses. These include:-

Most, if not all, of the species in the family have edible seeds. These are often too small and fiddly to be worthwhile, though several of the evergreen Elaeagnus species have quite large seeds. These seeds have a mild flavour, can be eaten raw or cooked and are a rich source of protein and fats.

All the species have a symbiotic relationship with certain soil bacteria. These bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing plant but some can also be used by other plants growing nearby. This means that all members of the family are excellent companion plants. When grown in orchards, for example, they can increase the yields of fruit trees by up to 10% (this is especially the case with plums and nuts which respond more to nitrogenous fertilization).

All of the species in cultivation are quite wind resistant, indeed the majority of them will grow successfully even in severe maritime exposure. Since most of the species can also be grown as hedges, they can provide a superb protection for windy gardens.

The fruit of many members of this family is a very rich source of vitamins and minerals (especially vitamins A, C and E), flavanoids and other bioactive compounds. It is also a good source of essential fatty acids, which is fairly unusual for a fruit. Current research indicates that consumption of the fruit greatly reduces the incidence of cancer in humans, not only that but the compounds in the fruit are possibly capable of slowing or even reversing the growth of cancers that are already in the body. Most of the research to date has been with the genus Hippophae, but the fruits of all other members of the family also contain these compounds.
Mais informações sobre a espécie no link:


Nenhum comentário:

Postar um comentário