These fast-growing woody crops are an especially important source for the generation of bioenergetics biomass. The Paulownia species is a plant part of this group, and because of its fast growth, multiple values, and high adaptability with climate conditions, is set recently in the centre of the attention. Paulownia is one of the fastest-growing species globally, with a low concentration of ash, Sulphur, and nitrogen, and high calorific energy from its wood. It is considered an energetic crop adequate to produce solid bio carburants and bioethanol. The cultivation of the Paulownia because of the high absorption of CO2 from the air to support the biomass's fast growth is considered an effective means to soften the climacteric changes. The plant is also considered suitable for improving the abandoned lands when its cultivation is concentrated on biomass production.
Paulownia trees are regenerating from the existing root systems, harvest between minimum 3 and maximum 5 turns (cycles 3-4 years) of growth of the wood without the need for replanting, deservedly earning the nickname of the wood Phoenix bird tree. Its deeply rooted system gives it the possibility of greening the degraded soil surfaces. It has a deep pivoting root of 10-12 m whose role is to stabilize soil, save it from landslides, and maintain the underground water systems. Paulownia trees are resistant to drought; their roots penetrate deep into the soil once fixed, looking for water, more than at the surface. They can manufacture medicaments (because they contain substances that positively affect the liver, kidney, gallbladder, lung diseases), feeding of animals, or organic fertilizer. Paulownia leaves are heart-shaped, having a diameter of (15-40) x10-2 m, being arranged in pairs on opposite branches and having rapid growth and a huge capacity of absorbing the carbon 4 dioxide (in a year it can absorb 100 tons of CO2 /ha per plantation) and producing 75 tons of oxygen.
Paulownia leaves also have properties that can be used in the cosmetic industry to produce perfumes and creams. Also, the flowers can be used for the same purpose, their aroma being one of vanilla or almond. It was demonstrated that this is due to the heliotropin content. One of the most promising applications is the manufacture of bioethanol from cellulose by two methods: using microorganisms especially cultured for this purpose or by relying on the effect of certain enzymes.
The wood is resistant to twisting (grows straight, clean and smooth), is resistant to contraction (no splits, no cracks) and deformations, it is stable during the modifications of humidity feels few downsizing or dilatations compared to most other types of wood; it has a fine texture, which makes from Paulownia a tree with exceptional wood for boats, pallets, household furniture, as well as plywood, houses, prefabs, semi-products and internal panels for construction; Recently this tree has received great attention for its beneficial environmental properties and was presented as a possible solution to the problem of deforestation at globally level, an issue that is central to the debate on climate change, plantations representing a curtain good forestry protection belt; It has very good fire resistance, having a high ignition temperature of 420-430°C compared with the average of hardwoods at which the ignition temperature is of 220-225° C; Paulownia is an exotic tree from which are used all parts of the tree as the trunk, leaves, flowers and seeds, the whole tree with its remarkable growth being a treasure for environmentalists.