Thuja plicata / Reuzenlevensboom

De reuzenlevensboom wordt in westelijk Amerika tot wel zo’n 50 meter hoog. Het is een van de belangrijkste houtleveranciers in Noord-Amerika en Canada. Het bekende ‘Western Red Cedar’-hout staat bekend om zijn lange levensduur. Constructies die worden blootgesteld aan weer en wind worden dan ook vaak van dit hout, in onbehandelde vorm, gemaakt. Zo gebruikten de Indianen de boom om kano’s van te maken. Vaak zijn het de lagere rassen die in ons land in de tuin worden gebruikt. De uiteindelijke lengte van deze conifeer in ons klimaat is 20 meter.

Het is een snelgroeiende boom met een roodbruine schors. De neerhangende takken beschermen de boom tegen zonnebrand. De twijgen van de Reuzenlevensboom zijn minder vertakt dan bij de andere soorten Thuja en de takken en het loof zijn iets grover. De glimmende, groene blaadjes geuren naar fruit wanneer ze aangeraakt worden. De kegeltjes die de boom vormt zijn eerst groen, maar worden uiteindelijk bruin.

Geschiedenis van de conifeer

Thuja is een conifeer met historie. Thuja is afgeleid van het Griekse woord ‘thuo’, dat offeren betekent. De boom werd gebruikt bij offerrituelen, omdat hij een heel aangename geur verspreidt tijdens de verbranding. Deze geur is zeer specifiek voor de Thuja. Uit verse bladeren, twijgen en schors worden etherische olie gewonnen, die hun toepassing vinden in medicijnen en parfums.

Een Franse ontdekkingsreiziger leerde in de 16de eeuw van de indianen wat voor positieve invloed de Thuja op de behandeling van scheurbuik had. Aan deze werking dankt de levensboom dan ook zijn naam.

Western Red Cedar, Giant Arborvitae, Giant Cedar, Incense Cedar, Western Red Cedar

Inner bark - fresh or dried. The inner bark can be dried, ground into a powder and then used as a thickening in soups etc or mixed with cereals when making bread. A pitch obtained from the trunk has been used as a chewing gum.

Western red cedar was employed medicinally by a number of native North American Indian tribes, who used it to treat a wide range of complaints[257]. It is seldom, if ever, used in modern herbalism. An infusion of the leaves has been used in the treatment of stomach pains and diarrhoea[257]. A decoction of the leaves has been used in the treatment of colds[257]. A decoction of the powdered leaves has been used externally to treat various internal pains, including rheumatism[257]. The leaf buds have been chewed in the treatment of toothaches and sore lungs[257]. A decoction of the buds has been used as a gargle[257]. A decoction of the small branches has been used in the treatment of coughs, colds and tuberculosis[257]. A weak infusion has been drunk in the treatment of painful joints caused by rheumatism or arthritis[257]. A poultice of the crushed bough tips and oil has been applied to the back and chest in the treatment of bronchitis, rheumatism, stomach pains and swollen neck[257]. An infusion of the twigs has been used as a wash in the treatment of venereal disease sores[257]. A decoction of the boughs has been used as an antidandruff shampoo[257]. A decoction of the stem tips and the roots has been used in the treatment of colds[257]. An infusion of the bark and twigs has been used in the treatment of kidney complaints[257]. An infusion of the seeds and twigs has been used in the treatment of fevers[257]. The chewed bark, or a decoction of the bark, has been drunk to induce menstruation[257]. A moxa of the inner bark has been used as a counter-irritant for the skin[257]. A poultice of the inner bark has been applied to carbuncles[257]. The bark has been pounded until it is as soft as cotton and then used to rub the face[257]. The very soft bark has been used to bind wounds and cover dressings[257]. The shredded bark has been used to cauterize sores and swellings[257].

Tolerant of light trimming and of reasonable exposure, this species can be grown as a hedge or as part of a shelterbelt[75]. An infusion of the boughs can be used as a hair wash to treat dandruff and scalp germs[257]. The fibrous inner bark can be pounded until it is soft and then used as a sponge for scouring dishes etc, or can be used for making rough clothing, blankets, mats, ropes, sanitary towels, a padding in a baby's cradle, nappies etc. Waterproof hats, capes, trousers, skirts etc can be made from the inner bark[257]. It is also used in thatching and as a stuffing material for mattresses[46, 61, 82, 99, 118, 171, 226, 257]. Inner bark strips have been used as a roofing material[257]. The bark has also been used to make paint brushes[257]. The inner bark has been used to make a wick for oil lamps[257]. The inner bark has been used for making baskets[257]. The roots are used in basket making, making nets etc[99]. The roots have been used in coiled and imbricated baskets[257]. The roots have been peeled, split and used to make coiled watertight baskets that can be used for boiling water[257]. The roots are harvested in the spring or early autumn when it is easier to remove the bark. The outer strips of the roots are used to make the bottom of the basket, the centre core is used in the coils and the root bark, because of its toughness, is used to make the edges[257]. The fibrous bark is used for roofing and the sides of shelters. It is also used as an insulation[61, 99]. A fibre obtained from the bark is used in making paper. The fibre is about 3.8mm long (this refers to the heartwood fibre, the inner bark fibre is probably longer)[189]. Branches can be harvested at any time of the year, they are cut into usable pieces and pre-soaked in clear water prior to cooking. They are then cooked for six hours or more with lye. It is difficult to rinse it to clear water because it seems to be a dye material[189]. The fibre is then hand pounded with mallets, or put through a blender or a ball mill for six hours. It is difficult to hydrate properly. The resulting paper is a rich deep brown/red[189]. The slender pliable branches are used as a high quality rope[257]. They are gathered in spring, peeled and, if thick, are split into halves or quarters. They are then twisted and worked until soft and pliable and finally woven together to make the rope[99]. A green dye can be obtained from the leaves and twigs[257]. The inner bark can be used as a tinder[257]. Wood - aromatic, light, soft, straight-grained, not strong, very resistant to decay. This resistance to decay is probably due to the existence of powerful fungicides in the wood[226]. The wood from fallen trees remains sound for at least 100 years[226]. It is pale to dark red in colour[226]. The wood was widely utilized by many native North American Indian tribes who used it for making a wide range of items including canoes, houses, totem poles, bowls, spoons, ladles and tools[226, 257]. It is currently used in making greenhouses[1, 11, 82, 171]. The wood is not of such good quality when grown in mild humid areas[1]. It makes a good fuel, burning with very little smoke, though it burns quickly[99].

Special Uses