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Valentine.gr  

April 2012


Did you know that a single plant of Water Hyacinth (Eichhornia crassipes) under ideal conditions can produce 5,000 seeds and 250 offspring in 50-90 days?

Water Hyacinth (Eichhornia crassipes)

Water Hyacinth - Eichhornia crassipes

Eichhornia crassipes, commonly known as Common Water Hyacinth, is an aquatic plant native to the Amazon basin, and is often considered a highly problematic invasive species outside its native range. Water Hyacinths are the only large aquatic herb that can float on the water unattached to the bottom.

The Water Hyacinth has special adaptations to allow it to grow and spread rapidly in freshwater. They can withstand extremes of nutrient supply, pH level, temperature, and even grow in toxic water. They grow best in still or slow-moving water. The seeds are dispersed by birds and can remain viable for 15-20 years. But the main method of reproduction is vegetatively, through stolons. A single plant under ideal conditions can produce 5,000 seeds and 250 offspring in 50-90 days, and cover an area of 600 sq metres in a year.

Its habitat ranges from tropical desert to subtropical or warm temperate desert to rainforest zones. It tolerates annual precipitations of 8.2 dm to 27.0 dm (mean of 8 cases = 15.8 dm), annual temperatures from 21.1°C to 27.2°C (mean of 5 cases = 24.9°C), and its pH tolerance is estimated at 5.0 to 7.5. It does not tolerate water temperatures >34°C. Leaves are killed by frost and salt water, the latter trait being used to kill some of it by floating rafts of the cut weed to the sea. Water hyacinths do not grow when the average salinity is greater than 15% that of sea water. In brackish water, its leaves show epinasty and chlorosis, and eventually die.

The fast-growing Water Hyacinth soon becomes a noxious weed outside its native habitat. Plants interlock in such a dense mass that a person could walk on a floating mat of them from one bank of a river to the other. The presence of Water Hyacinth disrupts all life on the water. They clog waterways preventing river travel, block irrigation canals, destroy rice fields, ruin fishing grounds. By shading the water, these plants deprived native aquatic plants of sunlight and animals of oxygenated water. As the mats decay, there is a sharp increase in nutrient levels in the water, which spark off algal growths that further reduces oxygen levels.

Water Hyacinths are difficult (if not impossible) to destroy. In the US, arsenic was used on a large scale which only partially cleared the weeds but poisoned the ecosystem. Fire and explosives were also attempted, but the plants reproduce rapidly even from the tiniest fragment and simply grew back. The most effective measures are biological controls, hundreds of which have been studied for this purpose. Two weevils, a moth and two types of fungi have been introduced to successfully control the plant. Other creatures that keep the plant in check include fish (Chinese grass carp (Ctenopharyngo idella) and Tilapia melanopleura and T. mossambica) and manatees.

The Water Hyacinth was introduced from its native home in South America to various countries by well-meaning people as an ornamental plant; to the US in the 1880's; to Africa in the 1950's spreading to the Congo, the Nile and Lake Victoria; also in India.

In Africa the plant was introduced by Belgian colonists to Rwanda to beautify their holdings and then advanced by natural means to Lake Victoria where it was first sighted in 1988. There, without any natural enemies, it has become an ecological plague, suffocating the lake, diminishing the fish reservoir, and hurting the local economies. It impedes access to Kisumu and other harbors. The water hyacinth has also appeared to the north in Ethiopia, where it was first reported in 1965 at the Koka Reservoir and in the Awash River, where the Ethiopian Electric Light and Power Authority has managed to bring it under moderate control at the considerable cost of human labor. Other infestations in Ethiopia include many bodies of water in the Gambela Region, the Blue Nile from just below Lake Tana into Sudan, and Lake Ellen near Alem Tena.

The plant is edible It is used as a carotene-rich table vegetable in Taiwan. Young leaves and petioles - cooked. Virtually tasteless. Said to be used as a carotene-rich table vegetable in Formosa. Javanese sometimes cook and eat the green parts and inflorescence. Flower spikes cooked too. Uses: In Singapore, as elsewhere, it was cultivated as pig food, but have become a serious nuisance in reservoirs. 

In Kedah (Java), the flowers are used for medicating the skin of horses. The species is a "tonic." In East Africa, water hyacinths from Lake Victoria are used to make furniture, handbags and rope. The plant is also used as animal feed and organic fertilizer although there is controversy stemming from the high alkaline pH value of the fertilizer. Also in Africa, fresh plants are used as cushions in canoes and to plug holes in charcoal sacks.

There are studies on using the plant to detoxify sewage and sludge. Water hyacinths are potentially an excellent source of biomass. Through an anaerobic fermentation process, polluted hyacinths can be converted to the natural gas methane - a costly process that may become more economical as supplies of underground natural gas are depleted. Dried and cleansed plants can be used as fertilizer and plant mulch. Eventually, living aquatic plants might serve aboard long-distance manned spacecraft, absorbing wastes and converting carbon dioxide to oxygen,--- then being themselves converted into food---. The plant can be cultivated for use in wastewater treatment, and can be incorporated into a system where the biomass is harvested for fuel production. Since this biomass is a by-product of wastewater treatment, it has a positive environmental impact, and thus poses no threat as competitor to food, feed, or fibre-producing plants. Wilted water hyacinth, mixed with earth, cow dung, and woodashes in the Chinese compost fashion, can yield useful compost in just two months. Although potential yields are incredible, so are the costs of removal or attempted eradication of this water weed. Standing crops have been estimated to produce 100-120 tonnes per hectare per year.  Water hyacinth roots naturally absorb pollutants, including such toxic chemicals as lead, mercury, and strontium 90 (as well as some organic compounds believed to be carcinogenic) in concentrations 10,000 times that in the surrounding water. 


Source:
http://en.wikipedia.org/wiki/Eichhornia_crassipes
http://www.naturia.per.sg/buloh/plants/water_hyacinth.htm
http://www.pfaf.org/user/Plant.aspx?LatinName=Eichhornia+crassipes

 

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Dove Tree - Davidia involucrata
Ashwagandha - Winter Cherry - Withania somnifera
Zabala - Lardizabala biternata
Longan - Dimocarpus longan
Flame tree - Delonix regia
Ïrchid tree - Bauhinia variegata
Pink Lapacho - Handroanthus impetiginosus
African peach - Nauclea latifolia
Golden Himalayan raspberry - Rubus ellipticus
Flame Thrower Palm - Chambeyronia macrocarpa
Toothbrush tree - Mustard tree - Salvadora persica
Monastery bamboo - Thyrsostachys siamensis
Nara - Desert melon - Acanthosicyos horridus
Candelabra tree - Euphorbia ingens
Shea butter tree - Vitellaria paradoxa
Tejocote - Mexican hawthorn - Crataegus mexicana
Tree of Damocles - Oroxylum indicum
Talipot palm - Corypha umbraculifera
Albany pitcher plant - Cephalotus follicularis
Nipa palm - Nypa fruticans
Marmalade Box - Genipa americana
Ice Cream Bean - Inga edulis
Gular - Cluster fig - Ficus racemosa
Kei apple - Dovyalis caffra
Stork's Bill - Erodium cicutarium
Camu Camu - Myrciaria dubia
Pemphis - Pemphis acidula
Sisal - Agave sisalana
Jute Mallow - Corchorus olitorius
Sugar Apple - Annona squamosa
Sapodilla - Manilkara zapota
Black Sapote - Diospyros nigra
Star Apple - Chrysophyllum cainito
White Ginger Lily - Hedychium coronarium
Yuzu - Citrus junos
Wild Loquat - Sugar Plum - Uapaca kirkiana
Tonka - Cumaru - Dipteryx odorata
Chinese bayberry - Myrica rubra
Wood Apple - Limonia acidissima
Açaí - Euterpe oleracea
Tindola - Ivy gourd - Coccinia grandis
Blue honeysuckle - Haskap - Lonicera caerulea
Balata - Manilkara bidentata
Calabash nutmeg - Monodora myristica
Allanblackia
Kola nut - Cola nitida
Rainbow eucalyptus - Eucalyptus deglupta
Elephant apple - Dillenia indica
Australian Christmas tree - Nuytsia floribunda
Honeywort- Cerinthe major
Aconite - Monkshood - Wolfsbane - Aconitum napellus
Crown of Thorns - Euphorbia milii
Abyssinian banana - Ensete ventricosum
Goldenrain Tree - Koelreuteria paniculata
Naranjilla - Lulo - Solanum quitoense
Brazil nut tree - Bertholletia excelsa
Sea grape - Coccoloba uvifera
Bignay - Antidesma bunius
Cashew - Anacardium occidentale
Giant Himalayan Lily - Cardiocrinum giganteum
African Hemp - Sparrmannia africana
Lychee - Litchi chinensis
Prickly Heath - Gaultheria mucronata
Hoodia - Bushman's hat - Hoodia gordonii
Cannibals Tomato - Solanum viride
Ashoka - Saraca asoca
Ackee - Blighia sapida
African plum - Safou - Dacryodes edulis
Solandra - Solandra maxima
Stapelia - Stapelia gigantea
Foxglove - Digitalis purpurea
Swiss Cheese Plant - Monstera deliciosa
Chocolate flower - Berlandiera lyrata
Sandersonia - Sandersonia aurantiaca
Northern Japanese Magnolia - Magnolia kobus
Champak - Magnolia champaca
Hooker’s lips - Psychotria elata
Suicide Tree - Cerbera odollam
Konjac - Amorphophallus konjac
Madagascar ocotillo - Alluaudia procera
Water Banana - Typhonodorum lindleyanum
Salak - Salacca zalacca
Natal Plum - Carissa macrocarpa
Ashanti blood - Mussaenda erythrophylla
Duranta - Duranta erecta
Maqui - Aristotelia chilensis
Manuka - New Zealand Tea Tree - Leptospermum scoparium
Suriname cherry - Eugenia uniflora
Australian Finger Lime - Citrus australasica
Sacred Flower of the Incas - Cantua buxifolia
Job's tears - Coix Lacryma-jobi
Velvet Bean - Mucuna pruriens
Java Apple - Syzygium samarangense
Screwpine - Pandanus utilis
Marimo - Aegagropila linnaei
Achocha/Caigua - Inca cucumber - Cyclanthera pedata
Rubber Tree - Hevea brasiliensis
Sugar cane - Saccharum officinarum
Sacha inchi - Plukenetia volubilis
Coffea - Coffee Tree - Coffea arabica
Liquorice - Licorice - Glycyrrhiza glabra
Mullein -Verbascum thapsus
Iceplant - Mesembryanthemum crystallinum
Chayote - Sechium edule
Roselle - Hibiscus sabdariffa
Black Goji - Lycium ruthenicum Murray
Rose Cactus - Pereskia grandifolia
Durian - Durio zibethinus
Jackfruit tree - Artocarpus heterophyllus
Cassabanana - Sicana odorifera
Chilean myrtle - Arrayan - Luma apiculata
Kurrajong - Brachychiton populneus
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Shell Ginger - Alpinia zerumbet
Harlequin Glorybower - Clerodendrum trichotomum
Coco de Mer - Lodoicea maldivica
Silver Tree - Leucadendron argenteum
Buffaloberry - Shepherdia argentea
Himalayan Honeysuckle - Leycesteria formosa
Raisin Tree - Hovenia dulcis
Borojo - Alibertia patinoi - Borojoa patinoi
Butterfly Pea - Clitoria ternatea
Honey Flower - Melianthus major
Ombu - Phytolacca dioica
Lion's Ear - Wild Dagga - Leonotis leonurus
Moringa - Miracle Tree - Moringa oleifera
Sea Daffodil - Pancratium maritimum
Spear Lily - Gymea - Doryanthes
Camphor tree - Cinnamomum camphora
Waterwheel - Aldrovanda vesiculosa
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Dead Man’s Fingers - Decaisnea
Bitter Melon - Momordica charantia
Shoapnuts Tree - Shoapberry - Sapindus
Acerola - Malpighia
Monkey Ladder - Sea Heart - Entada gigas
Cherimoya - Annona cherimola
Caper - Capparis spinosa
Lithops - Living Stones
Chaste Tree - Vitex agnus-castus
Chilean Lantern Tree - Crinodendron hookerianum
Parrot's Beak - Lotus berthelotii
Water Hyacinth - Eichhornia crassipes
Guaiac Tree - Guaiacum officinale - Lignum-vitae
Mickey Mouse bush - Ochna serrulata
Cow's Udder - Solanum mammosum
Miracle fruit - Synsepalum dulcificum
Akebia - Akebia quinata
Chilean Firebush - Embothrium coccineum
Caesalpinia - Caesalpinia pulcherrima
Welwitschia - Welwitschia mirabilis
Saguaro - Carnegiea gigantea
Schisandra - Schisandra chinensis
Monarda - Bee balm - Bergamot
Tamarind - Tamarindus indica
Neomarica - Walking Iris
Red hot poker - Kniphofia - Tritoma
Sikkim rhubarb - Rheum nobile
Reseda - Mignonette
Paulownia - Paulownia tomentosa
Belamcanda chinensis - Leopard lily
Blue Poppy - Meconopsis
Cannonball Tree - Couroupita guianensis
Tamarillo - Cyphomandra betacea
Goji - Wolfberry - Lycium barbarum
Vanilla - Vanilla Planifolia
Stevia - Stevia rebaudiana
Pachypodium
Physalis
Ceropegia
Sturt pea - Swainsona formosa
Clematis
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Jade vine - Strongylodon macrobotrys
Sansevieria - Snake Plant
Trochetia
Yareta - Azorella compacta
African tulip tree - Spathodea campanulata
Angel's Trumpets - Brugmansia
Achiote - Annato - Bixa orellana
Sausage Tree - Kigelia pinnata
Castor Oil Plant - Ricinus communis
Firewheel Tree - Stenocarpus sinuatus
Bat Flower - Tacca
Snake gourd - Trichosanthes cucumerina
Sedum
Hydnora - Hydnora africana
Pickerel Weed - Pontederia
Argan - Argania spinosa
Astilbe - False Goats Beard
Feijoa - Pineapple Guava - Acca sellowiana
Aquilegia - Columbine
Cassiope
Sweet Box - Sarcococca
Christmas Cactus - Schlumbergera
Foxtail Lily - Eremurus
Rue - Ruta graveolens
Pittosporum
Ylang-Ylang - Cananga odorata
Rose of Jericho - Anastatica hierochuntica
Gunnera
Waterlily - Nymphaea
Calico Flower - Aristolochia
Daylily - Hemerocallis
Contorted hazel - Corylus avellana Contorta
Torch Ginger - Etlingera elatior
Mistletoe - Viscum album
Devil´s claw - Harpagophytum procumbens
Teasel - Dipsacus
Pampas grass - Gynerium argenteum - Cortaderia Selloanna
Purple coneflower - Echinacea purpurea
Coral Tree - Erythrina crista-galli
Portulaca
Lobelia
Field Poppy - Papaver Rhoeas
Narcissus - Daffodil
Mimosa pudica - Sensitive Plant
Boxwood - Buxus sempervirens
Firethorn - Pyracantha
Star of Bethlehem - Ornithogalum
Cosmos
Muscari - Grape Hyacinth
Papyrus - Cyperus papyrus
Zinnia
Honeysuckle - Lonicera
Passiflora - Passion Flower
Calendula - Marigold
Lupine - Lupinus
Canna - Indian Shot
Witch Hazel - Hamamelis
Oak - Quercus
Brunsvigia - Candelabra Flower
Tree peony - Paeonia suffruticosa
Olive - Olea europaea
Cornflower - Centaurea cyanus
Desert rose - Adenium obesum
Oleander - Nerium Oleander
Abutilon
Sweet Pea - Lathyrus odoratus
Chaenomeles - Flowering Quince
Forsythia
Amaryllis - Hippeastrum
Butchers broom - Ruscus aculeatus
Bay Laurel - Laurus nobilis
Gloriosa
Bamboo
Gladiolus
Artichoke - Cynara scolymus
Clivia - Clivia Miniata
Dipladenia - Dipladenia sanderii
Date palm - Phoenix dactylifera
Peach - Prunus persica
Almond - Prunus amygdalus
Willow - Salix
Pomegranate - Punica granatum
Protea cynaroides
Colchicum autumnale
Bird of Paradise - Strelitzia reginae
Cardon - Pachycereus pringlei
Wolffia arrhiza
Puya raimondii
Fuchsia
Asphodelus - Asphodel
Primula - Primerose
Dicentra spectabilis - Bleeding Heart
Edelweiss - Leontopodium alpinum
Helleborus Niger - Christmas Rose
Zantedeschia - Calla Lily
Fritillaria imperialis - Crown imperial
Aster
Heliconia
Common Sunflower - Helianthus annuus
Bee Orchid - Orphys apifera
Convalaria majalis - Lily of the Valley - Muguet
Syringa Vurgaris - Lilac
Viola
Impantiens
Snowdrop - Galanthus
Poinsettia - Euphorbia pulcherrima
Dionaea muscipula
Banksia
Sea anemone
Amorrhophallus titanum
Rafflesia arnoldi

 

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