10 Graines Faux acacia, Robinia pseudoacacia
False acacia, Robinia pseudoacacia |
False acacia, Robinia pseudoacacia
10 seeds - Average germination: 70% - Diving the seeds in boiling water at 90ºC for 5 seconds. Immediately after pouring them into water with ice cubes and dip in this water for 48 hours. Then proceed to direct sowing.
The Robinier Faux-Acacia or Robinier (Robinia pseudoacacia) is a of family of ] Fabaceae (legumes of the subfamily of Viciaceae)1. This tree has Zygomorphic flowers characteristic in Fabaceae. Its fruits are pods resembling a flat bean with seeds inside.
It is a tree that reaches 20 at 30 M high for a meter in diameter1. It is very often Drageonant and forms sometimes invasive groves. The brown gray trunk is often double with a thick bark deeply cracked in the longitudinal direction1. Dragees and young branches are thorny. In coppice, it can make shoots of 20 M. The worse the terrain, the more it Drageonne and the thickets ensure their protective action. It could prepare for the arrival of other species but it is quite inevitable10.
The deciduous leaves appear late in the spring. They are imparried, with a large number (from 9 to 23) of leaflets ovals1; The stipules Leaves carried by non -flourous branches are transformed into Aigus Ahades , which persist several years after the fall of the leaves.
The flowers which appear between May and June are white, in clusters scented pendant and honey from 10 to 25 CM long1. The Robinier is an important honey plant but the secretion of Nectar is only abundant by a temperature above 20 ° C and is stopped by low temperatures and rain. Honey from the Robinier Faux-Acacia is never marketed under this name, but under that of "Acacia honey", which is botanically false but is a designation tolerated by use11.
The fruit are pods flattened, from 7 to 12 cm long, containing 4 to 12 seeds1 brunettes six to seven millimeters long to very hard integument . They remain fixed to the tree well after the fall of the leaves.
The Rhizosphere of the Robinier encourages bacteria nitrogen fixatives. The radicular system can extend over a radius of 15 meters around the trunk on dry terrains1.
Each year the spring wood appears as a porous ring. Between the cells of parenchyma large vessels are visible to the naked eye. In the fall, these vessels are obstructed by growths of the cells that border them, the Thylles. In the Robinier, the large ships of spring wood only lead the Sève only a season.
It is a tree Pioneer rapid growth (1.5 M high and 2 CM in diameter from the first year). It is enough of degraded terrains which it enriches, in fixing the nitrogen by its roots, like most legumes. He prefers fresh land, low in limestone, but can be satisfied with dry land. It does not grow in too wet and compact clay land13. Heliophile tree, it dreads the shadow but supports the frost.
Due to its very superficial radial root system, it can only be transplanted when it is young. For the same reasons, the tree does not bear the strong winds.
The Robinier does not well support severe size and pruning. If we absolutely have to do it, prefer the period just after flowering.
It is propagated by sowing then by two or three years' plants on the ground. The roots then emit many Dragees which quickly make many and excellent stakes14.
Around the world, the cultivated area increased from 227,000 to 3,264,000 hectares between 1958 and 1986, more than ten times more. With 3.2 million hectares in the world, it is the third petrol of planting leafy after poplar andEucalyptus.
Contents subject to the CC-BY-SA 3.0 license. Source : Article Robinia pseudoacacia by Wikipedia in French (Authors)
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